what 5 speed do i need?

[MJ86YJ90]

I have the 4 speed in the 86 now. I really want to put a 5 speed in. I am pulling the 4 speed to change clutch so I might as well swap to a 5 speed. whats a decent tranny for these?

[jimoshel]

You would have the AX4 now. The AX5 would be a bolt in. And they are decent trannys.

[Geonovast]

The AX-4 and AX-5 are literally identical except for that the AX-5 has the 5th gear parts. Gearing for 1-4 and R are identical.

 

Problem is going to be axle gearing. (assuming you have the 2.5)

 

2.5/AX-4 combo received 3.55 in the axles.

2.5/AX-5 got 4.10 in the axles.

 

Using the 5th gear with 3.55 axles is pretty much useless. I have a 2.5 with the MPFI system, originally came with an AX-4, but I put in an AX-5. Gutless in 5th unless you're running flat or downhill, doing 70+, and the wind at your back.

[MJ86YJ90]

ok the 3:55 are dogs so upgrading the rear would be good too. I am not looking to do a 4x4 swap but rather just give the truck a little pep and a mild lift for bigger tires and some wrangler rims. providing i find a decent price on rims

[dasbulliwagen]

If you can find the AX5 and its corresponding 4:10 rear axle to swap together, that would be your best option. I'm in the process of doing the same thing, except I am going 4wd, but Ive swapped the 4:10's in already and it gets a little buzzy in 4th sometimes, I have my AX% ready tp put in, just havent done that part yet. It did give the engine more pep too, as comapitvely, all the first 4 gears will now be lower, and your new 5th gear with that combo, should be the same as 4th gear with the 3:55's. The factory worked it out like that real slick!

[Geonovast]

How big of tires do you want? If you're going any bigger than stock, you'll probably want to go with 4.56.

 

Just for reference;

 

AX-4/3.55 (1.00 x 3.55) = 3.55:1 highest cruise ratio

AX-5/4.10 (0.85 x 4.10) = 3.49:1 highest cruise ratio