700R4 Tech Needed
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Supreme Member
Joined: Apr 2008
Posts: 2,342
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From: Dumfries, VA
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
700R4 Tech Needed
Here is my situation.
I blew the 305 in my 85 Z28. My guess is that it spun a main bearing, because it was knocking and backfiring real bad.
I bought a rebuilt 350 from a guy right here at TGO. Judging by the info he told me on the engine and all the additional parts I ordered for it, I'm estimating It's HP output in the mid 300's.
Heres the part thats got me real worried. My 700R4, as far as I know, is the original transmission in the car. That would put it right around 140,000 miles. The guy I bought the car from SAID he rebuilt the trans and installed a B&M shift kit. The entire time I've owned the car, it has not done anything out of the ordinary other than a WOT shift issue, which I'm assuming is a TV cable problem.
Best case scenario, if the guy rebuilt the trans and installed the shift kit like he said he did, will it be able to hold It;s own against the new engine for awhile until I can afford to pay a visit to bowtieoverdrives?
Worse case scenario, if the guy flat out lied and the trans has had nothing done to it since day 1 other than the fluid level being topped off...Well, I already know the answer. But given that I use a feather toe, how long do I have? What is the HP and TQ rating of a stock 700R4?
Also to make matters worse, the frame on my car is bone stock, and so is the rear end (as far as I know). All I can do for a month or so until I can afford at least some subframe connectors is go light on the gas and hope that not being able to afford the 24# fuel injectors just yet will be my saving grace.
I blew the 305 in my 85 Z28. My guess is that it spun a main bearing, because it was knocking and backfiring real bad.
I bought a rebuilt 350 from a guy right here at TGO. Judging by the info he told me on the engine and all the additional parts I ordered for it, I'm estimating It's HP output in the mid 300's.
Heres the part thats got me real worried. My 700R4, as far as I know, is the original transmission in the car. That would put it right around 140,000 miles. The guy I bought the car from SAID he rebuilt the trans and installed a B&M shift kit. The entire time I've owned the car, it has not done anything out of the ordinary other than a WOT shift issue, which I'm assuming is a TV cable problem.
Best case scenario, if the guy rebuilt the trans and installed the shift kit like he said he did, will it be able to hold It;s own against the new engine for awhile until I can afford to pay a visit to bowtieoverdrives?
Worse case scenario, if the guy flat out lied and the trans has had nothing done to it since day 1 other than the fluid level being topped off...Well, I already know the answer. But given that I use a feather toe, how long do I have? What is the HP and TQ rating of a stock 700R4?
Also to make matters worse, the frame on my car is bone stock, and so is the rear end (as far as I know). All I can do for a month or so until I can afford at least some subframe connectors is go light on the gas and hope that not being able to afford the 24# fuel injectors just yet will be my saving grace.
Senior Member
Joined: Jul 2006
Posts: 609
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From: Oslo, Norway
Engine: '85 Monte SS L69 305
Transmission: TH 200-4R
Axle/Gears: 3.23
Re: 700R4 Tech Needed
Stock it stands up to 350 ft-lbs of engine torque, and 650 ft-lbs of gearbox torque (after the torque converter). No Hp numbers are given.
I don't think you need to be overly cautious, but install a temp meter if you can as temperature extremes kills trannies as much as outright torque.
Here's the life of tranny fluid versus temp.
Degrees F - Miles
175 - 100,000
195 - 50,000
212 - 25,000
235 - 12,000
255 - 6,000
275 - 3,000
295 - 1,500
Over 300 will damage internal parts, and continous running under 150 is also advised against.
I don't think you need to be overly cautious, but install a temp meter if you can as temperature extremes kills trannies as much as outright torque.
Here's the life of tranny fluid versus temp.
Degrees F - Miles
175 - 100,000
195 - 50,000
212 - 25,000
235 - 12,000
255 - 6,000
275 - 3,000
295 - 1,500
Over 300 will damage internal parts, and continous running under 150 is also advised against.
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