Stock 72 gt rear axel

opelkid69 · 03-30-2006

Im looking to transplant a nissan sr20det into my opel. Just wondering if the transfer case will hold? The motor will prob put out a little over 300hp. Im guessing the rear end will not hold, dose anyone have any ideas for a rear end?

opelnut10 · 03-30-2006

Narrowed up 9" FOOOOOOOOOOOOrd or 12 bolt GM will both get it done. If you want to narrow it yourself as opposed to buying a housing 8 3/4" MOPAR will also stay with you, and they can be had pretty easy because Chrysler put them in everything. F0000000000000rd and MOPAR are hogshead type and 12 bolt is rear loader.

opelkid69 · 03-30-2006

Will that mess up my suspesion that i want to put in. Sport leaf springs and koni shocks would be preferable. Did the for have rear discs?

GTJIM · 03-30-2006

There is nothing that will fit the original suspension except the Opel diff due to the torque tube.
A 10-bolt from a late Camaro or Firebird has nice rear discs and would be strong enough but needs major suspension mods.

opelkid69 · 03-30-2006

would there be any chance the opel rear could hold?

lewdawg · 03-30-2006

Stock 72 rearend against 300 ponies...not a chance!!!

asdasc · 03-30-2006

Sure, if you put the stock wheels and tires on, the diff should be fine.

The cost of tires might be prohibitive, though! From what I hear, the stock diff is good for about 150hp, max.

GTJIM · 03-30-2006

Originally Posted by opelkid69

would there be any chance the opel rear could hold?

The Opel diff is a 6 1/2" diff the Camaro a 7.5"/7.625" crown wheel while the 12 bolt is 8.5" As they get bigger they get stronger. The poor wee spyder gears inside the Opel 6.5" diff won't take more than about 150hp - and not that if one wheel is spun for any length of time.

Just put "Diffs" in the Search box that drops down at the top of the page and see what turns up. There is HEAPS of info on this subject.

Here is one good thread: http://www.opelgt.com/forums/engine-...ighlight=Diffs

And another: http://www.opelgt.com/forums/engine-...ighlight=Diffs

asdasc · 03-30-2006

There is also a good one about using a BMW 320 or 325i rearend. Major modifications, but you get Limited Slip, Disk Brakes, Independent rear suspension, coil over shocks, and many choices of gear ratios.

03-30-2006	#1 (permalink)
opelkid69 Opeler Join Date: Mar 2006 Location: moneyapolis Posts: 6	Unanswered: Stock 72 gt rear axle Im looking to transplant a nissan sr20det into my opel. Just wondering if the transfer case will hold? The motor will prob put out a little over 300hp. Im guessing the rear end will not hold, dose anyone have any ideas for a rear end? Last edited by tekenaar; 03-31-2006 at 01:00 AM.

03-30-2006	#2 (permalink)
opelnut10 Living in the past Join Date: Oct 2005 Location: Chesapeake, Virginia Posts: 1,372 Real Name: Lloyd Provided Answers: 2	High HP rearend Narrowed up 9" FOOOOOOOOOOOOrd or 12 bolt GM will both get it done. If you want to narrow it yourself as opposed to buying a housing 8 3/4" MOPAR will also stay with you, and they can be had pretty easy because Chrysler put them in everything. F0000000000000rd and MOPAR are hogshead type and 12 bolt is rear loader.

03-30-2006	#3 (permalink)
opelkid69 Opeler Join Date: Mar 2006 Location: moneyapolis Posts: 6	high hp rear end Will that mess up my suspesion that i want to put in. Sport leaf springs and koni shocks would be preferable. Did the for have rear discs?

03-30-2006	#4 (permalink)
GTJIM Old Opeler Join Date: Jun 2003 Location: New Zealand Posts: 5,686 Provided Answers: 12	Diff There is nothing that will fit the original suspension except the Opel diff due to the torque tube. A 10-bolt from a late Camaro or Firebird has nice rear discs and would be strong enough but needs major suspension mods. __________________ GTJim Opel Owner since last Century! Copyright © 2000-2009 J D Henry All Rights Reserved

03-30-2006	#7 (permalink)
asdasc Senior Contributor Join Date: Oct 2005 Location: Mt. Clemens, Michigan Posts: 888	Sure, if you put the stock wheels and tires on, the diff should be fine. The cost of tires might be prohibitive, though! From what I hear, the stock diff is good for about 150hp, max. __________________ Steve "ever notice you are never done tinkering with the GT?" Never mind, I am WAAAY beyond tinkering now...[/SIGPIC]

03-30-2006	#5 (permalink)
opelkid69 Opeler Join Date: Mar 2006 Location: moneyapolis Posts: 6	would there be any chance the opel rear could hold?

03-30-2006	#6 (permalink)
lewdawg Member Join Date: Mar 2005 Location: Utah Posts: 191	Stock 72 rearend against 300 ponies...not a chance!!!

03-30-2006	#9 (permalink)
asdasc Senior Contributor Join Date: Oct 2005 Location: Mt. Clemens, Michigan Posts: 888	There is also a good one about using a BMW 320 or 325i rearend. Major modifications, but you get Limited Slip, Disk Brakes, Independent rear suspension, coil over shocks, and many choices of gear ratios. __________________ Steve "ever notice you are never done tinkering with the GT?" Never mind, I am WAAAY beyond tinkering now...[/SIGPIC]

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