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Old 09-19-2002, 01:17 PM
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Post screwed my 700R4 ???

I've got a '90 GMC Jimmy and I pulled a 72 Ford LTD (5500lbs) on a trailer. The LTD is a donor for motor/trans. Pulled it about 2 hours. Jimmy shifted fine, no problem during the trip, but when I unhooked the trailer, it won't go into 4th (and I'm not going to pull the trailer everywhere so don't suggest that. My 1st experience with 700R4. I guess their not made for towing. It won't shift into 4th gear at all. Any suggestions?

49 T&C

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Old 09-19-2002, 02:50 PM
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It has been awhile, but try these things. Frist check the fuse. Second check the connection at the tranny. Third check the operation of the disconnect switch on the brake pedal. I think i remmember the lock up as being elec. actuated. Hope this helps. I burnt up two of them in a row. They are great trannys when they work right.
Come to think of it both tranny`s i lost were as a result of towing.
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Old 09-19-2002, 02:59 PM
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Were ya pulling it in 4th gear (overdrive)? Those dudes aint made to haul in overdrive! The bouncing on the hitch is to much for the overdrive gear. I blew one on a 96 GMC Z71. They almost didnt warranty it cause I was pulling it in overdrive and not third. Anther two cents! Hope thats not the case and is something simple and inexpensive! Good luck!
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Old 09-20-2002, 05:28 AM
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I did use the other gears, starting out/up hills, but it was in OD for long, flat stretches. My bad. Just a tough/expensive way to learn about the trans. Guess its time for a trip to the junkyard.

thanks for the replys,49 T&C
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Old 09-20-2002, 06:53 AM
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See my other post? Look up 700r4 on the web. There are a ton of sites for this tranny. They will have trouble shooting guides and will show you how to check your cable adjustment. That way you can begin to rule out stuff. Let us know what you find.
Slider in Wa.
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Old 09-20-2002, 01:17 PM
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If you do end up getting a tranny out of a junkyard be careful. I learned the hard way that not all 700R4s are the same. The earliers 700R4s have different casing and they tend to get valves stuck or just break. The first one we had was a rebuilt junkyard pull-out and the valves stuck and overdrive didn't work. We ended up buying a brand new one, and haven't had a problem yet.
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