Question Transmission keeps jumping out of first gear 

Old 05-16-2012, 11:04 AM   #1
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When ever I am decelerating down an incline the transmisson will kick the shifter out of first gear. The only way to stop it is to force it back and hold it in place which is a challenge to keep there. My Jeep has a 304 with a t-15 transmission. Any ideas what the problem could be and how to fix it?
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Default Re: Transmission keeps jumping out of first gear 

Old 05-16-2012, 10:26 PM   #2
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Sounds like it's time for a rebuild.

 

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Default Re: Transmission keeps jumping out of first gear 

Old 05-17-2012, 12:37 AM   #3
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Mine does it in second gear, and also has a whine in first gear

 

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Default Re: Transmission keeps jumping out of first gear 

Old 05-17-2012, 12:55 AM   #4
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If stock (1979) the transmission should be a T150 not a T15. I’m not a transmission guru but a lot of things not inside the box can be related to popping out of gear from shot motor mounts, lack of a good transmission mount, and a missing or bad torque stud; could even be clutch misalignment. I would look at mounts or torque stud first before yanking the transmission.

 

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Default Re: Transmission keeps jumping out of first gear 

Old 05-17-2012, 01:01 AM   #5
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Sounds like in both of those cases its a bad synchronizer, that's the part that allows you to shift between gears with no grinding.
Like the other person said , rebuild time.

 

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Default Re: Transmission keeps jumping out of first gear 

Old 05-17-2012, 09:00 AM   #6
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Is a rebuild someone with a decent tech manual and some mechanical knowlege can do on his own or should I drop it and take it to a pro?
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Default Re: Transmission keeps jumping out of first gear 

Old 05-17-2012, 09:06 AM   #7
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Quote:
Originally Posted by Saddle Tramp View Post
If stock (1979) the transmission should be a T150 not a T15.

It has been my understanding that the 79s had both the CJs with a V-8 (like mine) hade the T-15 while the others had the T-150
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Default Re: Transmission keeps jumping out of first gear 

Old 05-17-2012, 10:48 AM   #8
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Js,

In answer to your question,Yes anyone that has common since and the ability to comprehend detailed instructions along with following the proper order of assembly can make it happen.
The only thing that may hold you up is time, and having some special tools, like pullers, a press and bearing drivers. If you have access to these things again by all means go for it, but don't use some backyard tools or approach to your rebuild that will come back to haunt you.

 

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Default Re: Transmission keeps jumping out of first gear 

Old 05-17-2012, 03:39 PM   #9
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I had my T-15 rebuilt, and it still pops out of reverse often.

I like checking what Saddle Tramp suggested before jumping into a rebuild.

These t-15's are very strong tranny's.

and yes internally pretty simple.

After having mine professionally done, I seen the gear sets, and shafts, and kicked myself for not going ahead on my own. (especially since it did not solve the problems. (but my input shaft bearing was toast and balls missing so it did need attention)


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Default Re: Transmission keeps jumping out of first gear 

Old 05-17-2012, 03:53 PM   #10
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also the T-15 is a common swap to stock T150's.

T-15's "should" have only been stock options behind v-8's (but occational stock upgrades behind 6's) from 71-75.

Sources:
Our Info section (BusaDave's Post): Manual CJ Transmissions
Novak: The Borg-Warner T15 Jeep Transmission - Novak Conversions

Which reads:
Borg-Warner T15 Transmission

The Borg-Warner T15 is a medium-to-heavy-duty, three-speed transmission, introduced in the 1971 Jeeps. It was offered in Jeeps up through 1975. The T15 was primarily found behind the AMC V8 engines as the base transmission, but was also found behind the AMC 232 and 258 I6 engines as an upgrade option over the T14. The upgrade to the T15 transmission was the Jeep T18 four-speed."

Though anything with these fun jeeps is possible

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