Tranny jumps out of gear when punched

[Mud Thrasher]

What would cause a tranny to jump out of gear when I hit it hard from a full stop? Also, it will only go into drive. It won't drop into 1 or 2. Am I looking at a rebuild and what did ya'll pay for one on a TH-4oo?

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'78 Chief 360/quadra-trac
D-44 f&r/3.55 r&p/31x10.5x15 G/Year Mt's
dual exhaust
Mallory Unilite Dist.
Edelbrock 4bbl 1405 carb
lined gas tank
free rust/new body soon

[OBX-AUTOMOTIVE]

HAY MUD,, CHECK YOUR LINKAGE***** GEMOBX/77/401

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[J4GRAND]

I agree with GEMOBX, check the linkage. If you do need a tranny rebuild, I got one done to my TH400 for $500. I r/r'd the trans, but the shop put a mild shift kit in it and it is the best $500 I've spent. Make sure you check with a trusted mechanic or your local BBB to find a reputable shop. Try to stay away from the "chain" tranny shops. Lots of cheap foreign parts and rebuilt units. Hope this helps.

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Patrick V.
73 J4000 "The Great Googley MoogleyGreat Googley MoogleyGreat Googley MoogleyGreat Googley Moogley"
360 V8 2V TH400 QT
83 Cherokee Laredo WT
258 I6 T176 "$300 Hunting Property Rig"
FULL-SIZE JEEP: Because size does matter!

[BobBarry]

Check that your motor mounts and tranny mounts are separated, allowing the drivetrain to shift around under load and pull the tranny out of gear. Also make sure your linkage connection points are tight/not worn and properly adjusted.

But first, disconnect the linkage and see if you can turn the shaft to shift the tranny through the full range of gears. If not, then the problem is internal to the tranny.

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Bob Barry<UL TYPE=SQUARE>* '78 Cherokee 4-door
* '88 Grand Wagoneer[/list]http://studentweb.providence.edu/~rbarry/wheels/

[jeepbob]

I had the same problem with a 78 chief turned out the tops of the body mounts on the frame had rotted out and the body would shift a little causing the shift linkage to move. The whole frame was pretty well toast and had a large hole rottd thru the right side.

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65 wag. 360/edelbrock rb4/t400/20 t-case/4:10 d27/d44 broken power lok/onboard air/onboard 110v power(no inverter)/1999 Lincoln t.c.leather buckets/Lincoln ctr console/winch/33x12.50/tunes/water proof door pads
soon to have new motor/d44frt/d60r(4:10)welded diff/custom bumpers
see ya in da mud

[Mud Thrasher]

I had already fixed one of the linkage hookups. The one that is on the frame is missing the rubber bushing in it. But, I didn't think that it would make a difference. Also, I just put a new tranny mount in. It's funny cause I have more problems with it then money to fix it with. I just drive it like it is till I get the money to fix it. Had to buy a new water pump yesterday.

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'78 Chief 360/quadra-trac
D-44 f&r/3.55 r&p/31x10.5x15 G/Year Mt's
dual exhaust
Mallory Unilite Dist.
Edelbrock 4bbl 1405 carb
lined gas tank
free rust/new body soon

[BobBarry]

Chrysler has redesigned the bushings; they're available for about $3/each, and easy to install.

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Bob Barry<UL TYPE=SQUARE>* '78 Cherokee 4-door
* '88 Grand Wagoneer[/list]http://studentweb.providence.edu/~rbarry/wheels/