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Old 10-05-2003, 02:57 PM
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TH700r-4 shift kit

I have a TH700r-4 in my 85 chevy blazer and the shift between 1st and 2nd gear is slow and laggy. The tranny fluid doesnt smell burnt or anything, and I have heard these transmissions have had some defects but I was wondering if a shift kit would help my tranny out and maybe help it last longer? It will probably need a rebuild soon, and I was wondering if the shift kit can be used again. One more question, will the shift kit shorten the life of the tranny?

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Old 10-09-2003, 01:35 PM
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any answers?
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Old 10-09-2003, 05:51 PM
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Your opening a big can of worms with that one...some people will swear that they increase the life of the tranny and others that it won't. The argument for the shift kit is that it reduces the gear over-lap and reduces clutch slippage by applying clutches quicker there for theoretically reducing wear. Of course the down side to this is that the jerk caused by the harsh shift can shear off spines and break parts not to mention the rest of the drive line. I believe that if you want maximum tranny life get a stage 1 shift kit which will shift firmer than stalk but not to harsh. Of cource harsh shifts are more fun
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Old 10-09-2003, 07:57 PM
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Cool can of worms

you could have several problems with the shift.

bad accumilator bore of the 1-2 . A bad band strut, worn through where the pin is..

you do not mention if this is a small blazer S-10 type? Tons of miles? recent OH?
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Old 10-10-2003, 02:58 PM
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Its an 85' K-5 blazer 355, it started when I went from a 305 to the 355. But the fluid isnt burnt or black and it shifts fine except for the fact that the shift is so laggy when I floor it. When I am going at part throttle it has a good shift. It also has new fluid.
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Old 11-14-2003, 08:39 PM
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Check your servo,I had junk shift from 1st to 2nd and what I found was a bad servo.I installed a hp servo and it barks tires 2nd to 3rd and shifts hard to 4th at wot throttle and I am running 35s.One thing my trans has alot of mods so the larger servo help,with a stock trans im not sure what you will get. Hope this will help.

350 Yota
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Old 11-14-2003, 09:18 PM
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Blaser 700R4

Before you install a shift kit verify the throttle cable is adjusted properly, Then Is the engine in good tune ,meaning is it lacking in power when it does the 1/2 upshift. The shift kit can be used again , and yes is the shift is sluggish, now then it will shorten up the shift time which will make it firmer. An easy and inexpensive cure for your problem could be just changing the Intermediate servo to a Corvette unit.
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