EA82Turbo Posted June 29, 2004 Share Posted June 29, 2004 Hi all I have a ea81T engine but I don't think the gearbox is standard. The gearbox is 5 speed with 2wd, 4wd hi and 4wd low. Currently I have a 3.9:1 diff on it but are not sure if it is the right diff? Would the car be drivable with the wrong diff? How would I test the gearbox ratio? Cheers Link to comment Share on other sites More sharing options...
Dr. RX Posted June 30, 2004 Share Posted June 30, 2004 Pull the front axles, count the number of spline on the stub axle, 23 usually mean a N/A tranny with a 3.90 ratio, if the count is 25, it usually means it is a turbo tranny with a 3.70 ratio. Not 100% fool proof, but is right probably 99.9% of the time for a 5 speed D/R on-demand 4WD tranny Link to comment Share on other sites More sharing options...
EA82Turbo Posted June 30, 2004 Author Share Posted June 30, 2004 Thanks So would the car be drivable with the wrong diff? Link to comment Share on other sites More sharing options...
WoodsWagon Posted June 30, 2004 Share Posted June 30, 2004 In 2 wheel drive, yes. In 4 wheel drive, no. the rear differential just freewheels until you engage 4wd. One easy way to check is to jack up both wheels on one side of the car, put 2 chalk marks on the tires, both at the same place, put the car in 4wd and turn the wheels. If the chalk marks still match, the diffs are the same, if they don't, you need a new rear diff. Link to comment Share on other sites More sharing options...
EA82Turbo Posted June 30, 2004 Author Share Posted June 30, 2004 cheers Link to comment Share on other sites More sharing options...
Dr. RX Posted June 30, 2004 Share Posted June 30, 2004 Gee, if you can figure out what the tranny ratio is, and you can see the decal on the rear diff that tells you the ratio there, why would you have to do all that wheel spinning??? Link to comment Share on other sites More sharing options...
XSNRG Posted June 30, 2004 Share Posted June 30, 2004 chalkmarks and jack stands are a lot easier than pulling an axle...:-) Link to comment Share on other sites More sharing options...
MilesFox Posted June 30, 2004 Share Posted June 30, 2004 the ea81 turbo was not available with the 4wd 5spd (not in the US anyway. ) you describe a dual range lever. there were part time dual range (23 spline) and full time dual range (RX) but if its in an ea81 body, which used 23 solined axles, mos likely you have a part time 4wd dual range from a non turbo, which will have a 3.9 gear go find soem sand or loose gravel, engece 4wd and see if she binds up or not Link to comment Share on other sites More sharing options...
MilesFox Posted June 30, 2004 Share Posted June 30, 2004 where did you get the car from? maybe we can trace it back to a usmb member as a previous owner? Link to comment Share on other sites More sharing options...
MorganM Posted June 30, 2004 Share Posted June 30, 2004 Pull the VIN and call a stealership Unless the trans has been swaped ? Link to comment Share on other sites More sharing options...
Dr. RX Posted June 30, 2004 Share Posted June 30, 2004 Chalk marks and jack stands won't give you the tranny ratio and that is what he is looking for. Pulling axles is easy if you know the trick, and since he wouldn't be completely pulling the axle, this won't be even easier. Fox and Shadow, the 85 and 86 RXs had the part time 4WD trannies and 3.70 ratio, plus 25 spline stub axles, actually the Fulltime 4WD trannies didn't show up until the 87 1/2 model. Link to comment Share on other sites More sharing options...
WoodsWagon Posted June 30, 2004 Share Posted June 30, 2004 My test wll tell you if the front and rear diffs match though, and thats what he cares about. My bets are on the 3.9, mostly because they're more common, and the prevous owner would have (or should have) alerted him if he had swapped in a 3.7 tranny, but not the rear diff. Link to comment Share on other sites More sharing options...
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