Joey Joe Posted July 31, 2006 Share Posted July 31, 2006 I swapped a 5 speed from a 87 GL in place of a 4eat into my 90 loyale. I am having problems with the 4 wheel drive and it is being caused by the rear dif. I have not driven it more than a few feet as to not damage anything. When I swapped out the auto could that have changed the gear ratios in the front but not the back? How do I tell the gear ratios of the rear dif and the 5 speed tranny, is there a place that will tell me. Also it could be that the dif is shot because I know that it leaks fluid, but it did seem to work fine with the auto about 4 months ago. Starting early on this problem before winter arrives. Thank you for your time. Quote Link to comment Share on other sites More sharing options...
Manarius Posted July 31, 2006 Share Posted July 31, 2006 I highly doubt the final drive ratio between the 4EAT and the GL 5MT are the same, that's why the car is binding very badly. Quote Link to comment Share on other sites More sharing options...
NorthWet Posted July 31, 2006 Share Posted July 31, 2006 The 4EAT used a 3.70 ratio rear diff, and the GL (assuming non-turbo... D/R, correct?) is a 3.90 ratio. Big problems if you try to use 4WD with that mismatch. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted July 31, 2006 Share Posted July 31, 2006 yep mismatched front and rear final drive ratios. Quote Link to comment Share on other sites More sharing options...
Joey Joe Posted July 31, 2006 Author Share Posted July 31, 2006 OKay good to know. The GL 5 speed was non turbo. I figured as much because Just moving about 4 feet I could feel a lot of pressure building. whats the difficulty of a ring and pinion swap. 1-10, and whats the price I am looking at. Quote Link to comment Share on other sites More sharing options...
NorthWet Posted July 31, 2006 Share Posted July 31, 2006 Far, FAR easier just to swap in a 3.90 rear diff. Standard diff on almost all Old Gen subes (Turbos excepted ). This should cure your bind and your concern about a leak. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted July 31, 2006 Share Posted July 31, 2006 Change the whole diff - you'll have to buy one anyway to get the ring and pinion, and it takes special tools to dissasmble them and change the gear set anyway..... yeah - get the whole diff. GD Quote Link to comment Share on other sites More sharing options...
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