700r4

[profe56]

I have 700r4 from 90 Chevy van C20, and 3.42 rear end. I've been driving about 1000 miles a year, It doesn't have lock up, but sooner or later I'll install it. Also I'd like try 3.73 posi.
great performance.

[mmsidaho]

I'm rebuilding a 1972 that came with a small block 400 and THM350 and a 3.07 rear end. I haven't decided what to do with the engine yet, but I'm wondering if I want to change the tranny as part of the restoration. Anybody have any thoughts?

[6772owner]

Overdrive makes the truck so much more pleasant on the highway, its easier on the engine and easier on fuel... I personally dont think Ill ever own another one w/o overdrive.

[Chvy2NV]

Does the drive shaft have to be changed/shortened to accommodate the 700r replacing the T350??
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[Rusbuilt]

Yes! I believe they took 3 inches off mine.
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[1972SUPERSB]

Yeah 700R4 are nice! Question will it fit in the trans tunnel on a 72?
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[Chvy2NV]

How about someone puts up a full write on what is need to complete the modification.
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[Rusbuilt]

My trans is an 87 model out of a camaro (no aux valve body) Others will work Bulk pieces would be the trans and torque converter, other items to buy...
1) TCI lockup kit
2) Shorten drive shaft about 3 inches
3) Move trans crossmember back (if I remember correctly the front holes in the crossmember will match up with the original back two holes in the frame, so drilling two holes is all thats required)
4) Correct brackets on the carburetor for the detent cable (TV cable)
5) Modify shift linkage

[GEARBOXGARAGE]

I think Bowler has the simplest Lock-up kit. Plugs into the factory electrical port and only needs one wire for hook up. It automatically locks up the converter 10 seconds after the trans shifts into 4th and auto matically unlocks when the trans down shifts. Also, the one wire that is needed for hook up also unlocks the converter with a 12 volt signal, commonly spliced into a brake light wire, so when you hit the brakes, it also unlocks the converter. Also look into getting a Throttle valve sleeve that corrects the part throttle down shift. Both B&M and TCI offer them. The factory valve sleeve will cause a down shift at about half throttle, coincidently about the same spot were your throttle is positioned at highway speeds. The B&M/TCI units improve this by moving the down shift point to about 3/4 throttle. The new TCI Consant Pressure valve body is a great upgrade regardless of your engine output, whether it be stock or highly modified. The 700R4 suffers from poor line pressure at idle and low rpm speeds (around 90 psi), causing slippage in the clutch packs. The TCI unit maintains a minimum of approx. 200 psi at all times, but look for a price tage around $300. Another common upgrade is updating the 1-2 and 3-4 shift servos. Some use the GM Factory Corvette Servos, adn these will get you some improvement, but if your after big horsepower, again, look to the aftermarket, such as B&M, TCI, etc. Moving on to weak points, the sun shell should be a concern when you start adding horsepower. They're week by design and crack. There is an aftermarket one, commonly refered to as "The Beast" because it's damn near indestructable. They can be acquired through Monster Transmission, I believe. Other week areas are the planetary gears, with the factory units only have 4 gears. Look for an aftermarket 5 gear planetary. Alot can be gained from the clutch packs, as well. If you really want to get into some tricky stuff, there are a few specialty tranny shops out there that will do some macine work to allow room for a few extra clutch discs for improved holding capacity. (Seems like I read an article on Phoenix Transmission,http://www.phoenixtrans.com/ that performed something to this effect) Also, upgrade the band, Alto Red Eagle has a good reputation. For converters, I like the TCI Breakaway for most high performance street apps. They run about a 2,400 stall speed and are availabe in lock-up and non-lock-up, but will set you back around $385-$475, depending on lock-up or not. If ground clearance isn't an issue, it doesn't hurt to add an extra capacity oil pan, either. All of these items have become readily available and more are being developed all the time due to the popularity of the o.d. trans use. Most of the upgrades I listed will easily get you to the 600 - 800 hp range, but it doesn't come cheap.

[NVBUYER]

Originally Posted by Rusbuilt

I have a 700r4 in my c10 as well, 327 V8 with a 3.08 rear and I'm getting almost 25mpg. I have the TCI lock up kit and the only major thing the transmission shop stated was proper adjustment of the detent cable or TV cable. Having the right brackets to attach it to your carb is a must!

I want to know how you get that kind of mileage!

I have a longbed, 350/700R4 combo, 3:08 with 29er tires. Any tips? Is yours injected?

[AusTx68]

Originally Posted by NVBUYER

I want to know how you get that kind of mileage!

I have a longbed, 350/700R4 combo, 3:08 with 29er tires. Any tips? Is yours injected?

Good question. My 2006 4Runner with a fuel injected V6 can't get 25 MPG

[Andy4639]

I have the 305 HO TPI motor with 89 700-R4 trans with B&M lock up. My motor had all the correct mounts for it so adjusting it was nothing.
It is activated by me with a switch. I had local trans shop install all the corvette upgrades to it before installtion. Been in the truck since 1991. The 700 will run fine without it just not as good of gas milage. If I tow my trailer I can use it without overdrive.
I had the 2 peice drive shaft cut to fit and you have to move the crossmember back to mate up to the transmission. I also have 4:10 gears and running 70 I turn around 2300RPM.
Speedometer is GPS from www.SpeedHut.comno cables wires nothing to transmission. Doesn't care what size tires you run either.

Short video of the speed & RPM's going up the highway.

I-85 10/20/12 4:30am - YouTube

[Rusbuilt]

Originally Posted by NVBUYER

I want to know how you get that kind of mileage!

I have a longbed, 350/700R4 combo, 3:08 with 29er tires. Any tips? Is yours injected?

No its a carb. 327 with less than 10,000 miles on the motor. I'm not sure why you cant get the same milage. I don't drive fast, just cruise and all I've done is adjust the timing and tweak the carb. I do however run 93 octane and 100% gas no ethanol added! You would be surprised by how much that helps.

[NVBUYER]

Originally Posted by Rusbuilt

No its a carb. 327 with less than 10,000 miles on the motor. I'm not sure why you cant get the same milage. I don't drive fast, just cruise and all I've done is adjust the timing and tweak the carb. I do however run 93 octane and 100% gas no ethanol added! You would be surprised by how much that helps.

Do you mind me asking what kind of carburator you're running? How many CFM? I run 91 octane with no ethanol too.
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[Rusbuilt]

its a 600 cfm edelbrock. Its hard to start but its great once its running. I actually plan to change it I want to go with something smaller.

[NVBUYER]

Originally Posted by Rusbuilt

its a 600 cfm edelbrock. Its hard to start but its great once its running. I actually plan to change it I want to go with something smaller.

Interesting! What kind of fuel pump do you have feeding it? Have you jetted it at all?

[Rusbuilt]

No jets, and when I bought it the truck had been sitting for a while and I replaced the pump and cleaned the tank and all that good stuff. What kind of milage do you get and whats your setup?

[NVBUYER]

Originally Posted by Rusbuilt

No jets, and when I bought it the truck had been sitting for a while and I replaced the pump and cleaned the tank and all that good stuff. What kind of milage do you get and whats your setup?

That's truly amazing. My mileage is currently 14 highway @ 70MPH

My setup is:
-GMPP 350 330HP/380 ft. lbs. (hungry, but I figured I could feed it a little less)
-670 CFM Holley Street Avenger (jetted down one size) no fuel return
-Heat shield
-3.5 inch tall air filter
-4psi fuel pump
-700R4
and a 3:08 rear with 29 inch tall tires (Lattitude Michelins)

No lift, stock height.

[Rusbuilt]

Originally Posted by NVBUYER

That's truly amazing. My mileage is currently 14 highway @ 70MPH

My setup is:
-GMPP 350 330HP/380 ft. lbs. (hungry, but I figured I could feed it a little less)
-670 CFM Holley Street Avenger (jetted down one size) no fuel return
-Heat shield
-3.5 inch tall air filter
-4psi fuel pump
-700R4
and a 3:08 rear with 29 inch tall tires (Lattitude Michelins)

No lift, stock height.

How is your detent cable hooked up? My overdrive kicks in at like 45mph

[piecesparts]

Originally Posted by NVBUYER

I want to know how you get that kind of mileage!

I have a longbed, 350/700R4 combo, 3:08 with 29er tires. Any tips? Is yours injected?

We put a 700 in my son's 86 SWB truck with a 3.08 gear ratio and the mileage went way down, due to having the engine running below it's power band. It went from 14 to 10 MPG. we then put a 3.73 gear ratio in the rear and now it is back to 14 MPG.

[NVBUYER]

Originally Posted by Rusbuilt

How is your detent cable hooked up? My overdrive kicks in at like 45mph

The throttle valve cable (T.V.)? Its taut at full throttle although I think (THINK haha!) the torque converter locks around 50MPH. Any ideas?

[NVBUYER]

Originally Posted by piecesparts

We put a 700 in my son's 86 SWB truck with a 3.08 gear ratio and the mileage went way down, due to having the engine running below it's power band. It went from 14 to 10 MPG. we then put a 3.73 gear ratio in the rear and now it is back to 14 MPG.

I've heard the same thing as well, the engine could be bogging and making the secondaries kick in right? (given that it's carburated)

[Rusbuilt]

Originally Posted by NVBUYER

The throttle valve cable (T.V.)? Its taut at full throttle although I think (THINK haha!) the torque converter locks around 50MPH. Any ideas?

Man I really don't know, I was actually getting 14-17mpg with my turbo 350 trans.

[Chvy2NV]

Are all 700's the same ? Or are there any model/ year better than others?? Are there any things to identify them by?
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