Overland Trucks

K e i t h,

Looks like I have two to choose from at the local pick-n-pull now. $65/ea. I think I will go through the trouble of getting both of them just in case someone underfilled them in the past. Both out of 2dr WD21s.

Hopefully I can get over there on Tuesday afternoon and get one of them out. I'd like to have both of them by next weekend to start seeing what I should do about swapping mine out. Lower 1st gear here I come!

What ratio are you going for? What's the year range with the different 1st ratios?

I've been contemplating the 300z T5 route lately for the HB. It looks like some were available with a 3.35 1st gear.

If it weren't for the fact that I already put a brand new tranny in the HB a few years ago and it still has less than 15k on it, I'd be considering it a lot more! Supposedly my tranny was for an '87 Pathy.

I WANT ONE!!!!!! (even though I have one)

they are 4wd trannies?

1st for 95 and earlier is 4.0 : 1

1st for 96 and up is 3.55 : 1

THe only thing you have to do to swap that tranny in is add a hole for the crank pos. sensor. It's easy. I used a 1/2" drill bit and a dial caliper to measure the distance from the mating surface to the center of the crank POS hole to get my calculations. I did have to use some 1/2" washers to space the crank sensor out due to the thinness of the pre96 bellhousing.

In Chris' case he can probably just swap the bellhousing since his current tranny should already have the sensor.

Obviously since you were swapping from an auto this wasn't an option for you...

I thought the bellhousing was part of the entire case assmebly?

It is and Bryian is on crack (butt-crack).

Yes, they are both from 2 door 4x4 WD21s, so they are the early-style 4.05:1 ratio 1st instead of my 3.58:1. Changes the crawl ratio to 73.6:1 from 65:1. Can't wait until those 5.38/5.42s and SAS gets done. That will get it up over 85:1.

3.35:1 is WAY taller than your 4.05:1, not a good thing, unless...

The T5 route (from an 84-86 Turbo Z) gets you the ability to do a Heep-style T5 with a Dana 300 t-case. Lots of internal parts swapping to make that happen. Oops the output is on the wrong side. I guess if you get creative you might be able to do the T5 with a Ferd 205, then do the ORD 203/205 doubler on that.

That's been the theory lately. A couple people have already gone the t-5 route. Use the Z tranny w/ a Heep output shaft any t-case with matching spline input and cirlcle bolt patter.....like say, an atlas?

Digging up a really old thread just to say I finally found the ratios for these old transmissions:

1st 4.061
2nd 2.357
3rd 1.490
4th 1.000
5th 0.862

Versus the D22 transmissions:

1st 3.580
2nd 2.077
3rd 1.360
4th 1.000
5th 0.811

Pretty excited to see what this will do for drive-ability with a much heavier truck very soon.

Don't the later (W)D21s have higher ratios than the earlier ones too? Or are they all the same?

All WD21 V-6 should be the same. I have a 95 WD21 tranny and it is 4.01123123123123 1st gear.

I can say that I love being able to put-put around on the trails in hi-range now. Combined with the 6.15:1 axle gears my truck is easily drivable in hi-range again. She is no drag-racer, that's for sure, but does get around okay.

4.061 x 3.92 x 6.15 = 97.9:1 crawl ratio! Since it is only on 37s she rolls really slowly...