T-176 and T-150 drop in compatible? - JeepForum.com
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post #1 of 20 Old 10-26-2021, 12:01 AM Thread Starter
enginman78
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T-176 and T-150 drop in compatible?

Howdy,

I have a 79 CJ-5 with the T-150 3 speed trans. I have available at reasonable cost, a T-176 4 speed. Will the 176 drop in w/o modification? What about the sheet metal cover plate inside the Jeep, is it the same for both? Thanks!

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post #2 of 20 Old 10-26-2021, 12:53 AM
pg_jglr
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Have you taken a look at Novak's site? I don't believe that those are a drop in but I could be wrong. https://www.novak-adapt.com/knowledge/
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post #3 of 20 Old 10-26-2021, 01:17 AM
80cj
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The T150 is mated to a Dana 20 transfer case and the T-176 is made to bolt to a Dana 300 . Both transmissions have the same bell housing bolt pattern so you can bolt the T-176 to your existing bell housing. The T-176/D300 has different length drive shafts than a T-150/D20. I've forgotten what the floor plate for a T-150 looks like but the T-176/D300 use a large shifter boot that incorporates both transmission and transfer case shifters. Also, the T150 and T176 came with different skid plates and not sure how difficult it is to mount a T-76 on a 79 skid plate.
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post #4 of 20 Old 10-26-2021, 04:46 AM
John Strenk
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^^^What he said^^^

I did this conversion in my CJ5 and it was well worth it in my opinion.

You will need a later model skid plate as the dana 300 seems to drop a little lower than the dana 20. But don't worry, the later skidpan will bolt right up to the frame. I'm sure you could modify the t-150 skid plate if you wanted to do that.

The T-150 clutch will fit a T-176 but the teeth doesn't seem to be a s deep as a T-176 clutch. But if you are that far, why not replace the clutch with the right one.

I bought my dana 300 separately and it came with a shifter for an T-4 combo and I was able to use the T-150/dana 20 boots. I bought a sheet of aluminum and made my own cover.
Putting the right shifter on the dana 300 for the t-176 changes the position of the shifter and you will be able to use the single boot.


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post #5 of 20 Old 10-26-2021, 11:00 AM Thread Starter
enginman78
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Hey guys,

Thanks for all the info, that really really helps! That's why I come to this forum, you all have so much more knowledge than I do about Jeeps!

Norm
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post #6 of 20 Old 10-28-2021, 08:56 AM
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Nothing to add about your swap question but curious why you want to swap them? Is it for the lower first gear?
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post #7 of 20 Old 10-28-2021, 09:29 AM Thread Starter
enginman78
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My current transmission has started slipping out of 3rd gear when you are decelerating towards a corner. I go to step on the gas to go some more and the engine revs. Step on the clutch, put it back in gear and go. It never slips out during normal driving, just on deceleration. And it's not like it does it every time, maybe 1 in 10 times when decelerating. I've gotten to where I keep my hand on the shift when I let of the gas so that it won't slip out. Said all that to say that's why I'm looking at the 4 speed. I do know that second through fourth is basically the same ratios at the three speed.
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post #8 of 20 Old 10-28-2021, 12:33 PM
80cj
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Quote:
Originally Posted by enginman78 View Post
My current transmission has started slipping out of 3rd gear when you are decelerating towards a corner. I go to step on the gas to go some more and the engine revs. Step on the clutch, put it back in gear and go. It never slips out during normal driving, just on deceleration. And it's not like it does it every time, maybe 1 in 10 times when decelerating. I've gotten to where I keep my hand on the shift when I let of the gas so that it won't slip out. Said all that to say that's why I'm looking at the 4 speed. I do know that second through fourth is basically the same ratios at the three speed.
The problem with the T-150 slipping out of gear on deceleration probably has to do with end play in the main shaft or that particular gear from wear. As you decelerate, the direction of end thrust changes because of the pitch of the helical cut gears and that little bit of play is enough to cause the synchronizer to disengage. Inertia from deceleration may also come into play. The T-176/177 are good transmissions and probably the best transmissions ever put in CJ's IMHO. Having the lower first gear is an advantage and the intermediate ratios are nice.

Do you know what transmission you have? T-176 and T-177's are externally identical. Check the tag on the front right of the transmission case.
5359389 is a T-177 with 3.82 first gear and from my research was used in CJ's 1981 and later.
5359390 is a T-176 with 3.52 first gear and was used in 1980 CJ's.
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post #9 of 20 Old 10-28-2021, 12:42 PM
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have you thought about a T-18?

Bullet proof,
Bolt right up to your t-case.
Bolt onto your skidplate.
Bolt up to your bell housing.

comes in two styles. One with a very low first gear ( 3 speed with a granny gear)
6.32
3.09
1.69
1.0
and one close ratio 4 speed.
  • 4.02
  • 2.41
  • 1.41
  • 1.0
Cons
Heavier than any other tranny.
Non syncro first gear.

There is also a T-19. Same as above but with a synchronized first gear.

https://www.novak-adapt.com/knowledg...anual/t18-t19/


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post #10 of 20 Old 10-28-2021, 01:56 PM
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T-18's were an option in 78-79 CJ's. If you could find one out of a CJ-5 it could be a bolt in if you got all the drive shafts, etc. I know that on a CJ-5 the skid plate was very close to the rear spring bracket. The T-18 for those years would be wide ratio so you would essentially have your T-150 with a graanny low first and reverse gear.

My peronal preference though, would be a T-176 or T-177. Most Jeeps spend 90% of their time on the street and the T-17x are very nice on the street.

Edit: Too bad you're in Michigan. I have a 1980 T-176 /D300 and rear drive shaft sitting on the proper skid plate taking up space around here. I would give it away.
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post #11 of 20 Old 10-28-2021, 07:28 PM
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Quote:
Originally Posted by 80cj View Post
....

Edit: Too bad you're in Michigan. I have a 1980 T-176 /D300 and rear drive shaft sitting on the proper skid plate taking up space around here. I would give it away.
Give us a few months and we would be glad to come pick it up personally.


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post #12 of 20 Old 10-28-2021, 09:39 PM
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Give us a few months and we would be glad to come pick it up personally.
I would be very happy to let you have it, John.
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post #13 of 20 Old 10-29-2021, 05:09 PM Thread Starter
enginman78
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Unhappy Dang, Hawaii

Quote:
Originally Posted by 80cj View Post
T-18's were an option in 78-79 CJ's. If you could find one out of a CJ-5 it could be a bolt in if you got all the drive shafts, etc. I know that on a CJ-5 the skid plate was very close to the rear spring bracket. The T-18 for those years would be wide ratio so you would essentially have your T-150 with a graanny low first and reverse gear.

My peronal preference though, would be a T-176 or T-177. Most Jeeps spend 90% of their time on the street and the T-17x are very nice on the street.

Edit: Too bad you're in Michigan. I have a 1980 T-176 /D300 and rear drive shaft sitting on the proper skid plate taking up space around here. I would give it away.
Hmmm, so I wonder what the cost to send it to Michigan would be. Any idea how much the tranny and xfer case weigh?
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post #14 of 20 Old 10-29-2021, 05:59 PM
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Originally Posted by enginman78 View Post
Hmmm, so I wonder what the cost to send it to Michigan would be. Any idea how much the tranny and xfer case weigh?
Probably around 150 lbs. Then either crate or palletize it.
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post #15 of 20 Old 10-30-2021, 03:03 PM
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John, do you think you have a "Fording Kit" that long, to stay above the waves, while driving out to pick this up?
Might need to have a flex tube with a buoy on the surface? Kinda like a crab pot buoy?

Quote:
Originally Posted by John Strenk View Post
Give us a few months and we would be glad to come pick it up personally.

'81 CJ5, 258 I6, T176 4 spd, 300 TC, D30 Front NT, 3.31, 2-Piece AMC 20 rear NT, 3.31
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