Need to know final drive ratio of the tranny

[CoriolisSTORM]

Ok guys and girls, I'm looking to find gear ratio for 4th gear in an Opel manual and the ratio for the automatic (if possible). Also, what about rear end gearing? I need to know this for engine selection.

[tekenaar]

Originally Posted by CoriolisSTORM Ok guys and girls, I'm looking to find gear ratio for 4th gear in an Opel manual and the ratio for the automatic (if possible). Also, what about rear end gearing? I need to know this for engine selection.

1:1 for both . . . rear ends are 3.44 in all 1.9 GTs!

[RallyBob]

IIRC you have a 1975 Ascona, correct? All the US Ascona's came with a 3.44 final drive in the rear axle. Transmission ratios as follows:

4-speed
1st: 3.428:1
2nd: 2.156:1
3rd: 1.366:1
4th: 1.00:1
Reverse: 3.317:1

Automatic
1st: 2.40:1
2nd: 1.48:1
3rd: 1.00:1
Reverse: 1.91:1

Of course, with the hydraulic coupling of the torque converter, there is no true mechanical lockup, so the transmission is always 'slipping' to a degree, dependent on load. This can usually be anywhere from 200-400 rpms higher than a manual transmission.

Bob

[CoriolisSTORM]

Thank you gentlemen greatly!