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Thread: Vega Trans for an Opel

  1. #21
    Moderator Site Supporter neuropel's Avatar
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    Do the shift towers interchange? GTs have that weird offset tower since everything is tilted.
    Paddle faster...I hear banjo music!
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    1973 Manta Rallye 2.5L
    1967 Kadett L Rallye 1.1L

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  3. #22
    Pending Member My location benncojr's Avatar
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    Bob,

    Thanks for the info. I have 4 extra stock transmission so the shift selector shaft will be taken from one of those when I sit down and do the repair.

    Neur,

    The shift tower from the sock GT fit the vega transmission, (correct me if I am wrong folks). The VEGA transmission is very simular to the GT Transmission (made by opel for both). The VEGA is a stronger to handle more HP then the GT. I well try to give you some comparisons photos of the two side by side when I have a chance.

    NOTE to Über Moderator (Keith Wilford) or Gary.

    This tread appear to be turning to a discussion on VEGA transmissions and how they match up on GTs/Opel in general... Could you change the title to better reflect this. (I would do it if I could...Hay at less it is in the right area of discussion )

    Thank you..you guys are the best!!

  4. #23
    Member svopel's Avatar
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    Gear Ratios

    Does anyone know what the gear ratios are in the Vega/Opel transmission ... especially, 2nd and 3rd gears?

    Are gears (and other parts) interchangeable between the two transmissions (Opel and Opel/Vega)?

    I tried to get those answers from a Vega website, but have received no responses. However, I found a Chevy/Vega "transmission rebuilder" in Michigan who said he has rebuilt tons of Vega transmissions but has never laid hands on the Opel transmission used in the 1971-72 Vega. Nor did he have information/literature on gear ratios. According to him, Vega used the Saginaw transmission after 1972, which is longer/larger than the Opel transmission.

    Thanks ... Ken

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    Pending Member My location benncojr's Avatar
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    Ken,
    From what I have found out the ratios on this is the same as the ratios in the standard Opel Tran. The only difference was the amount of power it could handle.

    I am sure somebody will correct me but that is why I purchased this item!! And yes it is still in storage waiting to be fixed and used!!

  7. #25
    former opel racer My location jeff denton's Avatar
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    There are a few differences, but none that can be easily detected by the naked eye. The input bearing is bigger, so you have to machine the bellhousing to fit the bigger bearing and snap ring. The second gear ratio is right at 2.0 to 1, compared to the GT's 2.019, third gear is 1.379 compared to GT's 1.316. This is gonna get me a bit more rpm in third, what I need in addition to a little more horsepower...
    The output shaft and its splines are bigger, I haven't got this far in my swap yet but it is rumored to be the same as the Opel auto yoke, thus it would be the Powerglide yoke, if I'm wrong somebody please jump in here...
    My swap will happen pretty soon, once the New Year arrives and I'm allowed to go back to racing... the one on the right is my wife.
    SHHHHH!
    Last edited by jeff denton; 12-09-2005 at 11:39 PM.

  8. #26
    Have Opel, Will Travel oldopelguy's Avatar
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    hmm

    So basicly the Vega one is the same as the 6-cylinder Opel ones then? Those changes you mentioned are the same as the origional 4-speed from the Admiral I'm not planning on using.
    Lots of Opels, for a long time.

  9. #27
    Member pastopel's Avatar
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    Well, if I may, allow me to throw a bearing here.

    What about a 74 Chevy Monza manual transmission? Many considered it the Vega successor back in the day. Has anyone investigated their potential?

    General Motors- the auto company of choices.

  10. #28
    Detritus Maximus opelbits's Avatar
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    I took a look thru my GM/Buick/Opel chassis and body parts catalog (February 1976 edition) and it lists the Vega part numbers where applicable to the Opel 4 speed. Oddly enough, except for a few instances, the Vega part numbers are identical to the Opel numbers.

    If there is any interest, when I get time, I'll post the interchangeable parts and their Opel/Vega numbers.
    "No, it's not fiberglass."
    "No, the motor is not in the back."
    "No, your friend in high school did not 'peg' his speedometer."

  11. #29
    Moderator My location soybean's Avatar
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    Quote Originally Posted by opelbits
    If there is any interest, when I get time, I'll post the interchangeable parts and their Opel/Vega numbers.
    I for one would be interested. Thanks, Jarrell
    You lose your dreams, you lose your mind. (The Rolling Stones)

  12. #30
    Member svopel's Avatar
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    Thanks, guys, for the feedback ...
    opelbits: If there is any interest, when I get time, I'll post the interchangeable parts and their Opel/Vega numbers.
    I am interested ... Thanks, Ken

  13. #31
    Detritus Maximus opelbits's Avatar
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    Okay, you guys asked, so here they are:

    7 02 8957606 Cover, trans. case (Vega-8957606) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 08 2877408 Cluster gear, countershaft (13-16-20-23 teeth) (Vega-2877408) (4.421....not sure what this last set of numbers mean) 68-75 All 1.5-1.9/69-73 GT 1.9/69-73 GT 1.9

    7 08 3443736 Kit, counter gear bearing roller (Vega-3443736) 68-74 (typo? maybe 75?) All 1.5-1.9

    7 08 3442446 (x2) Washer, trans. counter gear thrust (Vega-3442446) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 10 3442445 Countershaft (Vega-3442445) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 12 3775063 (x4) Washer, (spacer ring) trans. counter gear brg. roller (17x10.8x2mm) (1 15/64" thick) (Vega-6638457) (4.423) 68-75 All 1.5-1.9/69- 73 GT 1.9 (GT part number: 7775063)

    7 14 6634858 Ring, trans. main drive gear ball brg. lock (Vega-6634858) (4.376) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 16 6681770 Ring, trans. main shaft snap (Vega-6681770) (4.353) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 18 2897722 Gear, (1st speed) 27-31 teeth (Vega-2897722) (4.417) 69-75/69-73 GT All 1.9 from 69 trans. No. 136-9

    7 18 6667181 (x2) Cone, trans. (1st, 2nd, 3rd speed synchronizer) (Vega-6667181) 68-69 Kadett (1.5-1.9)/69 GT/70-73 GT 1.9 to trans. No. 135-9

    7 18 2897710 (x2) Cone, trans. (1st and 2nd speed synchronizer) (Vega-2897710) 69-73 GT 1.9 All 1.9 from trans. No. 136-9

    7 18 2877400 Snap ring, trans. gear shifter sleeve (Vega-2877400) (4.384) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 18 8953909 (x4) Spring, synchronizer (Vega-8953909) (4.413) 68-69 Kadett 1.5-1.9/69 GT 1.9 to 69 trans. No. 135-9

    7 18 8953908 (x4) Spring, synchronizer (Vega-8953908) (4.413) 69-75 all 1.9/69-73 GT 1.9 from trans. No. 136-9

    7 24 8977853 Gasket, rr. brg. ret. (Vega-3442081) 71-75 All 1.9/71-73 GT 1.9

    7 30 6681773 Gasket, trans. case cover (Vega-6681773) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 32 6695978 Shaft, (1st and 2nd speed) shift (Vega-6695978) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 32 3442082 Shaft, reverse speed shift (Vega-3442082) (4.309) 71-75 All 1.9/71-73 GT 1.9

    7 32 6680418 Pin, inter. lever reverse pivot (Vega-6680418) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 32 6680423 Cam, on shift shft (Vega-6680423) (4.302) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 32 6696089 Lever, (inter.) 1st and 2nd speed shifter (Vega-6696089) 68-75 All 1.5-1.9/69-70 GT 1.9 (71-73 GT listed differently number 732188)

    7 32 6680414 Lever intermediate (3rd and 4th and reverse) (Vega-6680414) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 32 8952416 Lever, reverse shifter (inter.) (Vega-8952416) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 32 3460271 Shaft, with lever and bolt-in trans. (Vega-3460271) 68-70 Kadett 1.5-1.9/69-73 GT 1.9

    7 34 6695985 (x3) Shoe, 1st and 2nd speed shifter (Vega-6695985) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 34 6667478 (x3) Shoe, 3rd and 4th speed (Vega-6667478) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 34 2897723 Fork, trans. shifter (1st and 2nd) (yoke) (Vega-2897723) (4.303) 69-75 All/69-73 GT 1.9 from 69 trans. No. 136-9

    7 34 6667468 Fork, (3rd and 4th speed) shifter (Vega-6667468) (4.395) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 34 6680425 Fork, (yoke) reverse speed shifter (Vega-6680425) (4.303) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 34 6696393 Plug, gearshift interlock detent (Vega-6696393) (4.311) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 34 2874102 Seat, reverse speed shift shaft detent spring (Vega-2874102) 68-72(typo?) All 1.5-1.9/69-73 GT 1.9

    7 34 6667617 (x2) Spring, trans. gearshift interlock thrust (Vega-6667617) (4.311) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 38 3460500 Washer, gearshift control hand lvr. (14x23.7x1mm) (Vega-3460500) 71-75 Model 50/71-73 GT 1.9

    7 38 738333 Finger, shift (component) (Vega-8965932) 71-75 All 1.9 from chassis no. 9393976 (Antwerp) 2304901 (Bochum) Possibly 71-73 GT also.

    7 38 8953223 Sleeve, control cable in upper gearshift tube (clamp) (Vega-8953223) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 38 2865035 Boot, shift lvr.-upr. (Vega-2865035) 68-73 All 1.5-1.9/69-73 GT 1.9 (listed as 'grommet')

    7 38 2865032 Boot, shift lvr.-lwr. (Vega-2865032) 69(typo?)-73 All 1.5-1.9/69-73 GT 1.9 (listed as 'grommet')

    7 61 2874880 Shaft, shift finger (bolt) (Vega-2874880) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 61 2893967 Bushing, shift finger lever (Vega-2893967) 68-70 Kadett 1.5-1.9, 71-75 All 1.9/69-73 GT 1.9

    7 61 2874890 Lever, selector (Vega-2874890) 68-75 All 1.5-1.9/69-73 GT 1.9

    7 61 3455655 Bolt, selector lvr. on supt. (support?) (23/64" x 1 1/?" ...the book had a 'B' in place of the number!) (Vega-3455655) 71-75 All 1.9

    7 61 8953235 Ring, trans. selector (Vega-8953235) (4.309) 68-75 All 1.5-1.9/69-73 GT 1.9


    And there you have it. The book has some errors and seemingly contradictory information, especially when comparing the GT numbers to the 1900/Kadett numbers. I've tried to point them out where I noticed them.

    I hope this is of some value.
    "No, it's not fiberglass."
    "No, the motor is not in the back."
    "No, your friend in high school did not 'peg' his speedometer."

  14. #32
    Moderator My location soybean's Avatar
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    Thanks opelbits for the info, something else to look for at the junkyard. It appears doable. That's a lot of typing too. Makes my fingers hurt. Jarrell
    You lose your dreams, you lose your mind. (The Rolling Stones)

  15. #33
    baz
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    boomerang opeler My location baz's Avatar
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    Quote Originally Posted by soybean
    That's a lot of typing too. Makes my fingers hurt. Jarrell
    jarrell have a peep at
    http://www.opelgt.com/forums/humor/8350-red-head-goes-doctors.html
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    All Rights Reserved

    B.O.O.B. founding member


  16. #34
    Opeler My location 72Rallye's Avatar
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    I copied this text from an eBay auction some time ago:
    "This is an Opel-made Chevy Vega 4 speed transmission. It has a 14 spline input and 27 spline output shaft. It measures approximately 14.75" in length. The following marks are on the case parts: main case, 3442062 OPEL, 165, date 12.10; tail housing stamped 3435916233. Tooth count on the gears are: counter gear, 23-20-16-13; gears, 16-19-24-31. 1st gear ratio is 3.43. I believe it's applicable to the '71 -'72 Vega."
    Calculating the gear ratios yields 1st 3.43, 2nd 2.51, 3rd 1.59 and 4th 1.00.
    The large input bearing is probably identical to the one on the overdrive transmission.
    Thomas

  17. #35
    former opel racer My location jeff denton's Avatar
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    The second and third gear ratios Thomas gave don't agree with the results of "laboratory" testing the transmission I have. Not even kind of close.
    When I get a chance I'll re-test it, I do it by marking the input and output shafts, have one person slowly and carefully turn the input 100 revolutions while another person counts the revolutions of the output. Maybe we'll turn the input a thousand times.
    Nah. Who's got time for that? A hundred is close enough?

  18. #36
    Detritus Maximus opelbits's Avatar
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    Soybean/SVOpel-

    No problem. It wasn't too bad typing it all out. I have ten fingers, so as one would get tired I could switch to another.

    Has anyone considered checking out the Cosworth Vega transmissions to see if there are differences from the standard Vega trans.? Or did they use the Monza type trans.?
    "No, it's not fiberglass."
    "No, the motor is not in the back."
    "No, your friend in high school did not 'peg' his speedometer."

  19. #37
    Detritus Maximus opelbits's Avatar
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    A quick search netted (get it? 'Netted'!) this:

    All 1975 models have a four-speed gearbox with the standard Vega ratios (3.11, 2.20, 1.47, and 1.00:1) coupled to a 3.73:1 axle ratio. Positraction (RPO G81) was an option.


    A new option for 1976 (RPO M75) was the Borg-Warner T-50 five-speed gearbox (3.41, 2.08, 1.40, 1.00, 0.80:1) coupled to a 4.10:1 axle. The four-speed with a 3.73:1 rear axle continued as standard equipment. Positraction continued as an option for both drivetrain combinations.

    This is from the Cosworth Vega Owners Association
    http://www.cosworthvega.com/unique_features.html
    "No, it's not fiberglass."
    "No, the motor is not in the back."
    "No, your friend in high school did not 'peg' his speedometer."

  20. #38
    Member svopel's Avatar
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    Thanks Opelbits for the Opel/Vega parts listing ... your extra effort is appreciated. Ken

  21. #39
    Opeler My location 72Rallye's Avatar
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    Jeff, my calculations were wrong. Since the text didn't say which tooth count goes with which gear I just made assumptions. The calculated first gear was the same as mentioned in the text, so I thought I got it right.
    If one reverses the order the first gear is still correct, but the ratios are now:
    1st 3.428, 2nd 2.156, 3rd 1.366 and 4th 1.000. Looks familiar? This is a standard Opel 4-speed.
    Thomas

  22. #40
    Pending Member My location benncojr's Avatar
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    Quote Originally Posted by 72Rallye
    1st 3.428, 2nd 2.156, 3rd 1.366 and 4th 1.000. Looks familiar? This is a standard Opel 4-speed.
    Thomas
    Thank you,
    You confirmed what I though earler

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