I have a '90 4runner with 4.10 gearing on 32x11.50. I'd like to go to 4.88's. A buddy of mine has a rear axle and front end from a '94 Auto trans 4runner. Would that mean they are either 4.56's or 4.88's due to it being an auto? Also, how could I check what ratio they are without the vin number, thanks.

 

You dont use the vin number. You use a code on the inside jam of the driver door. If you have them out count the ring teeth and divide that number by the pinion teeth.

 

The axle code may be in the engine compartment on the firewall directly behind the engine. Read the link here to find out what code means what.

http://toyota.off-road.com/toyota/ar....jsp?id=274535

This link is found on the Wiki page, in the FAQ for the model years it applies to. For future reference.

 

He no longer has the whole truck, just the rear axle and the front end. Is there a chance that it would also be 4.10? Or for sure will it be 4.56\4.88.

 

well if its only the axel you spin the driveline 2 times and how many times the tire spins is the gear ratio, aproxemently. it helps to make marks on the tire

 

my money would be on 4.56 unless it was a limited...

 

My 95 3.0 5spd with 31's came with 4:56's. A friends 95 3.0 auto with 31's came with 4:88's if that helps.

 

I'll give spinning the driveline a try. But thats all I really wanted to hear, is that it will be a lower gear ratio for sure. Thank you

 

That you can count on, lower gears I mean. The other likely candidate is 4.30. I have 4.30s that i swapped out of an automatic 4Runner on my truck. Never heard of an auto with 4.10, but strangely I have heard of automatics with 3.90s. I'm thinkin' they were 2WD, anyway they would be rare on a 4WD that's for sure. O.K., I checked that link(above), that's where I seen that. Says some 81 4WDs had the 3.90s, and the 2WDs.