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Old 09-02-2001, 10:03 AM
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Post Transmission experiencing problems

Hello and good-day to everyone.I have a Chevrolet diesel powered pickup from the late 1970's.It has the factory equipped 5.7 litre diesel V8 designed by oldsmobile.The truck had the turbo 400 tranny,but I took it out in favour for the 700-R4 because since I rarely tow anything with the truck,I decided that fuel economy was of a better issue.The 700-R4 is remanufactured as well as the converter.When on the interstate going at approximately 100km/hr,the truck performs okay on a flat level grade.But as soon as I approach a grade,the truck loses alot of speed and drops back to 65-70km/hr.When this occurs,I depress the accelerator a little,but I avoid lugging the engine.This however does'nt help.The engine speed is okay,but the truck is plain lazy on the hills.There's no constant speed.When the turbo 400 was there,it had all kinds of power and speed,even when I had my 24-foot trailer on tow with a rather heavy farm tractor out back.But now,with the 700 series tranny,it's useless when even pulling my trailer.I have to put the selector down into low 2 to get any power out of it in the hills.The truck has 3.42's out back.It's a 1/2 ton version and two wheel drive.The 700 tranny I bought is for a gasoline application though.Does this make a difference?Is the convertor malfunctioning,or is it mismatched for the diesel?There is a electrical plugin on the 700 series tranny.This is'nt hooked up.What is causing the problem?Please,can somebody tell me what's wrong?What do I need to do in order to get it right?Is there a kit or something I need to remedy this,or does the converter need to come out?I was told that the diesel and gas powered 700-R4's are the same.Again,any help or suggestions would be appreciated.Thank-you to all.

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Old 09-06-2001, 06:48 PM
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[ September 07, 2001: Message edited by: edcroozer ]
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Old 10-10-2001, 06:31 PM
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700 gas and diesel trannys are different in the gearing I have a friend with a GMC diesel van, came stock with a 700r4 the tranny went bad so it was replaced with a used gas unit and the problems began first he thought the used trans was bad because of all the chugging so he had it rebuilt the guy rebuilding it told him there was no much wrong but rebuilt it anyway, same problem now he has a th350 in the van and is happy with it
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