Dying trans, need swap help - JeepForum.com
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post #1 of 23 Old 07-20-2009, 10:28 AM Thread Starter
swatson454
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Dying trans, need swap help

After reading a recent post about a new clutch not fixing his tranny grinding it's way into 1st and Reverse, it looks like I'm going to have to bite the bullet and get a tranny.

I'm kind of Forrest Gump with trannies so you guys can probably tell me just by reading this. It does the long grind thing going into Reverse and a short, choppy grind going into 1st. I've adjusted the clutch to where anymore causes it to slip and adjusting it the other way just creates more freeplay in the pedal. It still "chunks" (that's what it sounds like) going into 1st and even with the pedal to the floor it wants to drag but won't really start to engage until the pedal is over halfway up. Does that make any sence?

Anyway, if I do end up needing a tranny, I really want to go 5-speed but just can't afford the strong NVs. There is a huge salvage yard in Spokane but they don't have anything older than 1994. Would that be a decent place to source a 5 speed? I think I read somewhere that there were two overdrive options with that tranny too so how can I make sure that I get the .86? Last one, how weak are they? Horsepower rating?

Edit: After posting here, I got the correct fluid in it but Lord knows what 25 years of previous owners have done. There wasn't much in it when I drained it.

Thanks for your help-


Shawn
http://performancecarbscience.com/blog/

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post #2 of 23 Old 07-20-2009, 10:36 AM
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Your clutch dragging problem could be caused by a worn clutch pilot bushing. I had this happen to me when hada a 76 CJ-5. It was weird because at times it would make a funny sort of rubbing or groanining sound.

As far as 5 speeds go, Jeep used the T-5 for a few years but they're regarded ast a light duty transmission and I've heard of guys breaking them with the stock six cylinder. Another choice would be the NV3500 but the cost is higher and you get into adapters, I believe. Drive shaft lengths would have to be altered.

Which tranny do you currently have?
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post #3 of 23 Old 07-20-2009, 10:45 AM Thread Starter
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I'm pretty sure it's a T-4 but not exactly positive on how to tell. Regularly breaking them with stock 6s? That's no good
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post #4 of 23 Old 07-20-2009, 10:50 AM
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You might also consider finding an AX15 5 speed tranny out of a Jeep YJ oy Cherokee. It can handle mild V8 power. It came with both internal and external slave cylinders. With either it will be easier to use a hydraulic clutch than try to keep a manual clutch setup. The AX15 has a .79 overdrive. I have seen many for sale on sleezbay and in the classifides on this web site. Just be sure it is a 4wd version so you can mate with your transfer case, which by the way means that you will need an adapter to mate to a D300. The adapter is also used with the NV3500.
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post #5 of 23 Old 07-20-2009, 11:04 AM Thread Starter
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Neither of those options sound fantastic, all things considered. Is the T-4 a difficult rebuild? It goes into 2nd, 3rd and 4th perfectly so I'm thinking that an entire rebuild isn't really necessary. What parts would likely be bad given my description above and I'm guessing many years of GL-5 fluid and low levels?

Last edited by swatson454; 07-20-2009 at 11:59 AM.
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post #6 of 23 Old 07-20-2009, 12:17 PM
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rebuild

THe T-5 & T-4 trannies are exactly the same except for the 5's .86 overdrives. The rebuild can be rather perplexing if you've never been inside one before. You will need a rebuild manual with all the specs to help. You will need a press, gear puller, snap ring pliers, feeler guages, and some other hand tools.

You can not just rebuild one particular gear. The rebuild kit has all the gaskets, small parts, bearings, and synchronizers for the whole tranny. Any replacing of individual main parts like shafts and gears will have to be ordered seperately after disassembly and inspection.

I have the rebuild manual for these tranny's. If someone crawling the thread can tell me how to post the 4.11 MB file I will post it for everyone to have.


Last edited by jeepmaster03; 07-20-2009 at 12:20 PM. Reason: spelling
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post #7 of 23 Old 07-20-2009, 12:47 PM Thread Starter
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I guess I should make sure what tranny this is, huh...

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post #8 of 23 Old 07-20-2009, 12:55 PM
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Take the cover over the hump inside the jeep out and post a picture of the top cover of the transmission. That will tell the tale. You may have an SR-4 or a T-4.
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post #9 of 23 Old 07-20-2009, 01:38 PM Thread Starter
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Here we go...




And since where doing this clarity thing, is this the 300?
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post #10 of 23 Old 07-20-2009, 02:16 PM
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that looks like the T-4 to me. I dropped and opened mine so Im pretty sure it is.
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post #11 of 23 Old 07-20-2009, 02:26 PM Thread Starter
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I don't know who makes the SR-4, but my tranny has "Borg Warner" cast into it just below the shifter.
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post #12 of 23 Old 07-20-2009, 04:20 PM
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SR-4 is another Bog-Warner tranny used by AMC for a short while. It's Junk.

You do have a T-4, and yes that is a Dana 300 T-case.

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post #13 of 23 Old 07-20-2009, 04:46 PM Thread Starter
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Great, thanks!
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post #14 of 23 Old 07-20-2009, 04:49 PM
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Since he's looking for a 5 speed, won't a T-5 just bolt in place of the T-4?
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post #15 of 23 Old 07-20-2009, 05:23 PM
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short answer yes, it will bolt right up. Not sure why he wanted NV3500. I assumed he was looking for something strong, so I sugested AX15. But in stock form he could use a T-5 reliably.
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