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Unread 09-29-2013, 05:24 PM   #1
AF-Jeff
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FUUUUUUUUUUUUUUmyLIFE

So I was driving to autozone to get some new shocks and a new tranny mount.

But about a couple blocks away my jeep started slowing down.
I went from going 40 down to 30 and finally 20 before reaching the store.
My RPM's didn't drop. I actually had to increase the RPM's so I wouldn't drop below 20 mph.
Upon arriving my engine was hot. I barely went two miles and it was already too put my hand on the radiator cap.
I could start her easy but it was like the driveshaft was only getting a portion of what the engine was trying to put out.
also the jeep feels a little jerky and the needle was bumping all over the place.

So I need help. A lot of help.

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Unread 09-29-2013, 07:00 PM   #2
Little Green
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Sounds like your transmission is slipping and not allowing the power from the engine to go through to the wheels.
I believe the 727 transmission is able to be adjusted but not positive.
I think a visit to a transmission shop is in order
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Unread 09-29-2013, 07:56 PM   #3
Renodemona
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Could be slippage or very low fluid level. The engine was probably hot because it was running at high RPM without much cooling air being forced into the radiator. A trip to the transmission shop sounds like a near-future outing indeed.
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Unread 09-29-2013, 09:15 PM   #4
AF-Jeff
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Well it looks like I'm going to the transmission shop. Thanks guys.
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Unread 09-30-2013, 01:07 AM   #5
pleontks
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79 would be the th400

Always check your fluid first whenever your tranny feels weird.
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Unread 09-30-2013, 04:32 AM   #6
Little Green
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Also might try trans fix fluid from Lucas. Sold at Pep Boys. Works great.
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Unread 09-30-2013, 09:51 AM   #7
super98lsc
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If its slipping that bad in 1st gear the clutches are likely done for. Even if the cause was low fluid by now there is probably damage done.
Tear down and inspect/replace whats bad.
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Unread 09-30-2013, 12:10 PM   #8
Dr. Marneaus
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check your fluid level in the trans, wont shift right if its too low.

If the trans is toast (TH400 is not adjustable) its only like $700-$800 to have one rebuilt, so its not the end of the world.
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Unread 09-30-2013, 12:41 PM   #9
pleontks
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Marn........I've been looking at tranny rebuild kits, but there's soooo many choices. What did you end up using?
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Unread 09-30-2013, 01:16 PM   #10
Dr. Marneaus
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Quote:
Originally Posted by pleontks View Post
Marn........I've been looking at tranny rebuild kits, but there's soooo many choices. What did you end up using?
I'm not a race car driver, i dont plan to enter king of the hammers, and I dont tow like it's a semi. So, the kit below was what I went with, though i did toss in an B&M plate style trans cooler.

http://www.summitracing.com/parts/sum-705001/overview/

That being said, I effed it up. Apparently one of the lip seals was not perfect, and I also slightly bent a clutch in the last pack. Took the shop 2 weeks to figure out what the heck was going on because the symptoms were so random and it air checked every time they tried. This resulted in me spending $700 to get it rebuilt after already spending $350 on a kit, a new trans case, and a torque converter.
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Quote:
Well I figured it up and over a period of time, This four thousand dollar car of mine, Cost fourteen thousand dollars And ninety-nine cents, well now! - Jerry Reed


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Unread 09-30-2013, 01:53 PM   #11
pleontks
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Marn.....I will be reviewing your tranny thread before tackling mine
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Unread 09-30-2013, 02:05 PM   #12
Dr. Marneaus
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Quote:
Originally Posted by pleontks View Post
Marn.....I will be reviewing your tranny thread before tackling mine
If you do it on your own, get in touch with gsmikie, or whatever. He has a DVD that is him pulling apart and reassembling a turbo400.

Thats about all I used. video quality is marginal, but it has literally every step of the process on film. My failures had nothing to do with that being my main resource, it was a lack of proper tools for the lip seals, and i am not sure how i bent the clutch. i think it wasnt seated right when i bolted down the front pump.
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Well I figured it up and over a period of time, This four thousand dollar car of mine, Cost fourteen thousand dollars And ninety-nine cents, well now! - Jerry Reed


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Gone but not Forgotten: 97 TJs Build Up.

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Unread 09-30-2013, 02:54 PM   #13
super98lsc
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I have done several GM/Mopar/Ford's over the years and Marn is correct its all in the tools and attention to details. Having a good clean environment to work in, space to lay it all out on the bench then a ton of patients to check/re-check/ then check again. Items like he mentions with the lip seal tools sometimes can add up to the cost of the labor of having it built. The only "up-side" is you did it on your own an now know the unit inside and out for the "next-time".

A large cooler is the main thing for any automatic to live a long life.
If auto manufacturers installed larger coolers then autos would go 2x the distance from day one. Ask any quality shop or powertrain engineer they will say the same.
Th-400 with a solid stock rebuild will take a lot of power for a long service life, not much need to "hop one up" too much unless your stuffing a blown big block in front of it and trying to tow ships out of the mud. Just my .02

-RM
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 09-30-2013, 08:03 PM   #14
AF-Jeff
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I topped off the transmission oil after I bought it. it was about half what it needed. I'm not sure how long it was like that. I'll check the oil lvl and get it inspected as soon as I can. I also might check the exhaust. I heard if it is blocked it could cause a reduction in speed.
I'll let you know what turns up.
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Unread 10-02-2013, 05:07 AM   #15
jeepdaddy2000
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Is it a Q trac? Might want to insure the t case isn't in emergency drive. Not uncommon for binding of the drivetrain to occur with the front axle engaged.
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