700R4 build thread.

[HUSTLESTUFF]

I just want to thank clinebarger for this amazing thread and his help. I used it to rebuild the 700R4 I put in my girlfriends 72 c20 and I finally got the truck running after a frame off rebuild. Goes forward and reverse and shifts great. Many thanks!!!!!

[BHR]

hey guys great thread and alot of info on the 700r4 and what each part does thanks to clinebarger for his contributions

i do have some question i have a 700r4 with the transgo 2-3 kit and noticed after the install my downshift points have changed i used to be able to downshift for 3rd to 1st at under 30mph now its at under 20mph would anybody know what changes need to be made to get them back to what they were?

could possibly transgos new 3-2 shift valve (the new valve that also requires you to drill 3 holes in the VB one near the bathtub and two more as vent holes also near the bathtub and 2-3 valve) be the cause?

can i omit the spring from transgos new 2-3 shift valve for easier downshifts as you state in here but you state it for the original setup?


some more info about trans trans was from 91 fbody has original z28 skeleton governor and matching VB would be able to downshift to 1st below 30mph from what i could tell it had superior 2nd apply servo and the accumulator housing was double staked with 2 pistons

then had a rebuild with the trangso 2-3 kit tg separator plate installed the kit puts the vette servo back as well and a different accumulator spring setup with one piston along with the other changes described in here could the different servo and accumulator setup cause the downshift points to change?

[jamyers]

Using the TransGo Separator Plate, with a Corvette 2nd Servo Piston and a .500 Boost Valve..

Transgo says that with the bigger 2nd Piston, drill passages A and C to between .093" to .110".

I understand the Corvette servo can give rough 1-2 shifts, would drilling these to the smaller end of the scale keep the shifting from being too harsh?

Also, I think that passage A = 3rd gear Apply and C = 2nd gear apply, can anybody confirm that?

[clinebarger]

Originally Posted by jamyers

Using the TransGo Separator Plate, with a Corvette 2nd Servo Piston and a .500 Boost Valve..

Transgo says that with the bigger 2nd Piston, drill passages A and C to between .093" to .110".

I understand the Corvette servo can give rough 1-2 shifts, would drilling these to the smaller end of the scale keep the shifting from being too harsh?

Also, I think that passage A = 3rd gear Apply and C = 2nd gear apply, can anybody confirm that?

Post a pic of your instruction sheet!

2nd apply with a 093 piston & stock converter......No bigger than .076".

3rd & 4th apply are good at .110"

A .500" TV Boost is dangerous territory for stock Cast Pump Rings!!

[jamyers]

Pic of the instructions is below, with my notes scribbled on it. Both holes measure as i wrote on the sheet, a numbered drill (mics at .082) fits a bit loose and the other (mics at .086) won't go in.

I've got a new 10-vane pump on the way, Wellington Parts number A74531AK. I believe it's got steel rings, but the description on Amazon doesn't say. Any way to confirm?

I'm also going with hole A = 3rd and C= 2nd?

Regarding the .500 boost valve, the trans came with a .420 in it. For a stock converter, stock 350 engine, 3.73 rear gear daily driver (that might see some performance add-ons in the distant future), would either boost valve be preferrable?

[jamyers]

The pump kit just arrived, hooray for Amazon Prime!

I'll upload pics of the rings, about all I can tell is that they're black...
The old rings that were in the pump are shiny all the way around...

How do you tell if they're cast or steel?

Sadly, the large metal sealing ring is broken, looks like the box got dropped and it cracked. Would it be ok to re-use the old sealing ring with a new o-ring?

[clinebarger]

A.....3rd Clutch Feed. .110"
B.....2nd Clutch Feed. .073"-.076"
C.....3rd Exhaust. .093"
G.....3-2. .076"-.086" OK if already bigger.
E......4th Clutch Feed. .110"

[jamyers]

Thanks! I've got the transgo unbreakable rings on the way.

I REALLY appreciate the info!

EDIT:

I emailed the seller of my pump kit, asking about whether the rings were steel or cast iron. Here is their reply, which makes me want to laugh and cry at the same time.

"Dear 2nabot,

Because they are attracted to a magnet I believe they are steel.

-lakewood-trans-parts"

The lesson here is to only buy known reputable parts from known reputable sellers.

[vrruumm]

clinebarger, thanks a million for this wealth of knowledge. Having installed many trans kits in the past, and not been happy with the results, I was able to decipher what to use where and how to set it up all in one shot... Thanks to this topic. Just finished building my first 383 and dove right into the transmission. Upshifts, downshifts, etc, it all works perfectly. Im still grinning ear to ear from the first test drive 2 hours ago!

[koop67]

Clinebager great thread! i am looking for a 2500rpm convertor any recamendations?

[Rickysnickers]

Unfortunately, Clinebarger is no longer around. I have a 700r4 and purchased an FTI unit in the range you are looking for. I like it.

[vrruumm]

Not super happy with the b&m tork master 2400. Feels completely stock.

[Hart_Rod]

Old thread, but easy question. The output shaft has 2 holes in which you can align the speedo gear. How do you know which one to use? Thanks in advance!

[Hart_Rod]

Found a video online, it goes in the most forward hole. Posting just in case anyone else runs into this. Got everything back together and the speedo is dead on!

[WTO]

Looking for some ideas on how to correct line pressure flutter in 3rd or 4th over 1/2 throttle. Gauge bounces from 125-200PSI rapidly. I see it was recommended not to block the line bias valve, I'm confident that is the cause of my pressure problem.
Trans is in a 68 C2500, 4:11 gears and worn out 327. I have a 355 ready to go in but want the trans 100% 1st.
Valve body modifications were the transgo SK700 kit. I went back and reduced the boost valve from .500 to the next one down, .475 I believe. This improved shift feel but did not fix the line pressure flutter.
TV cable geometry is set up properly. The trans works/shifts perfect, without a pressure gauge you would never know there was a problem.

[beanious]

Hello all, wanted to see what your thoughts are regarding 700R4 - 4L60 - 4L60E servo pins.

Option 1: The 84-87 pins had (2) teflon rings to seal the servo pin.



Option 2: In 87 there was a factory update and following this they did not include the shaft seals.



Option 3: Sonnax has a servo pin that has (2) teflon seals and an o-ring.



Note, there are also different lengths but I'm not really focused on length rather the seals (2 ring tip, 3 ring tip and HD band)

[beanious]

Which do you think is better? Do you think the more seals the better, no seals are required, all original 84-87 w/ only 2 seals??? Transmission experts input requested!

[clinebarger]

I started using the Sonnax Pin exclusively a couple years back as I was welding extra length on stock pins just about everytime when using OE 4L60E Borg Warner Bands.

[beanious]

Clinebarger, you're still on the forum! Man, I owe you a beer or dinner or something. Your writeup gave me the info needed to get into rebuilding 700R4 & 4L60 transmissions. I really approciate the feedback, I kinda feel like I got a reply back from a legend

[beanious]

Hello, just wondering what everyone's opinion is on the 3-4 accumulator setup.

Common consensus seems to be either: block the case passage with a plug or install a super stiff spring.

I really don't like permanently modifying the case, so this time I stacked two pistons and some shims in the 3-4 cup and set the clearance at 10-16 thousandths of play. What are your thoughts???

[beanious]

I was finishing up the rebuild on the '92 4L60 and I wanted to annotate some oddities of the 1992 version.

1) The governor doesn't have a upper mount for a governor clip


2) A second boss is present on the passenger side, assuming it's for mounting electrical connections


3) There's a metal vent tube instead of the plastic one

[beanious]

Finally got the old truck some road miles, the 3-4 accumulator stackup works great. It shifts quick, firm but not too much. All in all pretty darn good, hopefully it will save the 2-4 band for some miles later on down the road!

[Duck1]

Originally Posted by beanious

I was finishing up the rebuild on the '92 4L60 and I wanted to annotate some oddities of the 1992 version.

1) The governor doesn't have a upper mount for a governor clip
Attachment 2106396

2) A second boss is present on the passenger side, assuming it's for mounting electrical connections
Attachment 2106397

3) There's a metal vent tube instead of the plastic one
Attachment 2106398

I pull 3-4 700-R4's a month I've only seen 5 of those clips in 10 years

[bennylava]

This looks like fun, rebuilding your own transmission. But it wouldn't be fun if it didn't work right. Or if it died after 8 months of use.

I'll do it someday when I have a backup truck.

[Lokin4AReason]

Cool thread . . .