New transmission or gears? - JeepForum.com
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post #1 of 16 Old 06-12-2019, 02:37 PM Thread Starter
jwwhittle
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New transmission or gears?

After taking it out on the shakedown cruise I know I need a slower crawl ratio. 81 CJ5 with scout 44s stock 3.54 I believe, T150 3spd and Dana 20 tc. Thinking about a locker in front and 3.73 gearing or different transmission. Which do I do first?


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post #2 of 16 Old 06-12-2019, 02:41 PM
stripperguy
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I had the same gearing, transmission and xfer case as you.
I went to 35's at the same time that I swapped in 4:56 gears, T5 transmission and a D300 xfer case.
Crawl ration is good for everything except really serious rock krawling...On road or trails or mud is just right.
I would still like to swap in 4:1 gears for the D300.

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post #3 of 16 Old 06-12-2019, 04:08 PM
Fourtrail
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IMHO, swap to a T-176/177 Dana 300 combo, lower first and better low range on the t-case. If you plan to do hardcore crawling, then look at a T-18 instead of the T-176. It will drive down the road about like your T-150 does now as both are close to a 3:1 start out gear. I don't think you would see an extremely noticeable jump going from 3.54's to 3.73's. Play around on Grimm Jeeper to test different transmissions and gear ratios until you find one you like.


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post #4 of 16 Old 06-12-2019, 05:35 PM
CSP
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Going from 3.54 to 3.73 would be a complete waste of time and money. If you're going to do a gear ratio change, make it a noticeable one.
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post #5 of 16 Old 06-12-2019, 05:57 PM
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I agree with making a significant change or you will be disappointed. Honestly go for the gear change first if you canít do both, then do a T18 or T19 tranny if you want some serious torque. Iíve got a 1983 Jeep CJ7 401 V8, T18a w/granny low (6:32), Geared at 5:14, Dana 300 twin stick, Dana 44 w/Detroit Locker, Ford 9" w/ Yukon Grizzly, Alloy Axles. Horrible to drive on the pavement, amazing off road!


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post #6 of 16 Old 06-12-2019, 11:32 PM Thread Starter
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The Jeep guy here in town ( Colorado Springs) had a T18 with a 300 , but I couldn't afford it then. I would have needed an adapter plate to mate to a 360? What other transmission will bolt to my bell housing? As for regearing to go anymore than 3.73 I'll have to change carrier? Thus the locker and 4.10 maybe? I'm rolling on 33 now. Probably look for a suitable transmission &TC for now. T176 ? I want to be able to go seriously offroad not necessarily rock crawling with minimal highway use.
Thanks for the info,

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post #7 of 16 Old 06-13-2019, 02:36 AM
80cj
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3.92's are available for D44's. I think that would be a good ratio for 33's and you'd still have decent highway RPM. Dana 44 diff case break is 3.73 and down, 3.92 and up.
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post #8 of 16 Old 06-13-2019, 07:20 AM
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Even if you had a crawler geared trans, you would still need better gearing.
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post #9 of 16 Old 06-13-2019, 12:04 PM Thread Starter
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So to go with 3.92 in front and rear I'm going to need to replace both carriers? I was thinking some kind of locker up front but not necessarily in back?

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post #10 of 16 Old 06-13-2019, 12:43 PM
John Strenk
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Quote:
Originally Posted by jwwhittle View Post
The Jeep guy here in town ( Colorado Springs) had a T18 with a 300 , but I couldn't afford it then. I would have needed an adapter plate to mate to a 360? What other transmission will bolt to my bell housing? As for regearing to go anymore than 3.73 I'll have to change carrier? Thus the locker and 4.10 maybe? I'm rolling on 33 now. Probably look for a suitable transmission &TC for now. T176 ? I want to be able to go seriously offroad not necessarily rock crawling with minimal highway use.
Thanks for the info,
No adapter need for a AMC 360. It's a bolt on to a stock AMC bell housing. Same bolt pattern for the 232, 258, 304, 360 and 401.

A T-176 or T-177 will bolt up to a 300. T-177 has a little lower 1st gear but is a good tranny for most uses but no granny gear. The T-4 and T-5 has a better 1st gear and the T-5 has over drive.


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post #11 of 16 Old 06-13-2019, 12:46 PM
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Quote:
Originally Posted by jwwhittle View Post
The Jeep guy here in town ( Colorado Springs) had a T18 with a 300 , but I couldn't afford it then. I would have needed an adapter plate to mate to a 360? What other transmission will bolt to my bell housing? As for regearing to go anymore than 3.73 I'll have to change carrier? Thus the locker and 4.10 maybe? I'm rolling on 33 now. Probably look for a suitable transmission &TC for now. T176 ? I want to be able to go seriously offroad not necessarily rock crawling with minimal highway use.
Thanks for the info,
If you have a T150, then a T176, Ford T18, or Ford NP435 will bolt to your current bellhousing. If you have a true T150 bellhousing, then it should also have the bolt holes for a Jeep T18. The 3:1 1st gear in the T150 is very limiting on the crawl ratio. I would recommend a transmission swap 1st, then a gear swap. The transmission you end up with partially dictate what gear ratio you pick. For serious off-roading, I'd look at one of the granny gear transmissions (T18, NP435). The NP435 has lower gears in 1st and 2nd. If you get a 77-79 CJ T18, you're D20 will bolt to up with the factory adapter. With either Ford transmission you would need an adapter to either the D20 or D300.

Quote:
Originally Posted by jwwhittle View Post
So to go with 3.92 in front and rear I'm going to need to replace both carriers? I was thinking some kind of locker up front but not necessarily in back?
Yes, with the D44, the 3.92 uses a different carrier from 3.73 down.

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post #12 of 16 Old 06-14-2019, 09:41 AM Thread Starter
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Thank you jp360 that's good info. I'll start hunting today. Is there a way to ID a transmission out of the vehicle? The place here has a pile of them already out, as in the year and make, ie Ford jeep?

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post #13 of 16 Old 06-14-2019, 09:43 AM Thread Starter
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And which TC is preferred, Dana 20 or the 300?
John thank you also.

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post #14 of 16 Old 06-14-2019, 09:51 AM
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Visual, casting numbers, and ID tags. For the T18, a Ford will have the PTO on the passenger side & the CJ will have it on the driver side. Also, Jeep used quite a few different versions of the T18. If you want to keep your D20 and have a granny gear, you'll need a 77-79 CJ version. You can also use one from a mid/late 70s FSJ with a D20 and swap in a Ford input shaft (~$200).

check out www.novak-adapt.com under the knowledge section for very good ID information

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post #15 of 16 Old 06-14-2019, 10:07 AM
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Originally Posted by jwwhittle View Post
And which TC is preferred, Dana 20 or the 300?
John thank you also.

Dana 300. Independent control of front and rear outputs, lower low range out of the box, more aftermarket low range options and upgraded output options.
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