Who besides me prefers to use an early 4L60E pump in a 700R4 blocking the 2nd feed at top right square hole in case, Adding back forward clutch feed at pump in case. Eliminating tube, blocking hole for it in accumulator, Replacing FWD accumulator spring with 4th accumulator spring. Eliminate ball in forward accum housing.
I started doing this years ago . Eliminated trying to find sizes for center boost valves. Give nice smooth throttle pressure with TV cable pull. Ads pressure control back to manual 1 and 2 and of course eliminate increasingly hard to find decent 700r4 pumps.(you can actually use later 4L60E pumps too as long as early stator)
Works super well and yes forward accum still works and presure with a sonnax or transgo .500 boost valve runs at about 60 psi at idle and 220 at WOT with a nice smooth transition.
Just putting something out there for opinions and discussion. Keep forum active
Other added advantage allows use of deep 4L60E pan and filter.

 

Very interesting!!!

 

Will this method work with a transgo sk700 shift kit? Transmission I'm working on has the kit in it already

 

Sure other than the obvious boost valve will work just fine.

 

Thank you for a response and thank you for writing this up was having a difficult time finding a 700R4 pump

 

Yes I started running into that a few years back finding decent 700 pumps and the right PR valve combinations, So I figured out how to do it this way and found it not only works its BETTER in every way. Better pressure control, cleaner line rise and the added advantage of running a 4l60e deep filter and pan with no adaptors.
You're welcome. I generally try and use the early 4l60e pump but you can use any short stator oring pump. I have literally done 100s like this never an issue .

 

when you say early pumps......what yrs are you referring to ?

 

93 to 97 before they pump ridge on them to align bell on bolt on units tough those will still work

 

I seem to ran into a problem, reverse works great. Low 1 engages but has no pressure, does not move vehicle. D does not engage. Any ideas? I'm dropping the transmission again today to tear it back down

 

Did you drill hole for forward feed in case ? Its missing in later cases

 

If not you will only have reverse and no forward gears ,

 

Sorry for late response, actually after breaking it down and watching some videos I started to think of drilling that hole to connect vb with pump, now reading this just confirmed my suspicion, thanks for your time and experience, found a ripped forward piston seal while breaking it down too, so glad I ran into this problem

 

I have been looking into doing it this way, I have drilled later 4l60e pumps out to use the accumulator tube and have had luck with them. Can you clarify about blocking the 2nd feed ? Also does lockup work with this setup?

 

Yes lockup works normally and by second feed i mean the square hole with round hole in it towards front case right side head towards bell. Its not really a second feed but feeds manual second oil in the 700 to the boost valve assembly to maintain max manual pressure in Manual 1-2 , But since the middle valve assembly is missing with the 4l60e pump it feeds into an empty area so a pretty large leak, When using the 60e pump pressure works the same way in manual gears as it does in the 60e and varies with throttle position. FAILURE to block this hole you will lose about 10 PSI main line as a leak in manual 1st and 2nd. It's most easily blocked by driving a check ball into it at the square hole into the slightly deeper round area. Do not try and do it from the pump side you will break the case,
You probably already know how I know all this BEEN THERE DONE THAT.
Basically, I figure this out because at my former employer we were having issues finding decent 700 pumps and good middle boost valve sizes, This was the solution I came up with , Worked awesome with added advantage or being able to use 4l60e filter and deep pain.
Just don't forget drill forward feed hole pump to case it is missing in late cases, Block Tube feed to accumulator hole in aux VB Cup plug works well. Leave out ball in aux body, replace fwd accum spring with 4l60e 4th accum spring . You will be golden as they say . Any 4L60E pump with oring seal will work, But I generally use early styes 93 to 97 no sense in wasting the crowned later pumps. And the early pumps are generally cheaper. PWM or NOT does not matter.

 

I am catching up on a TON of reading here on the Forum (Major Health Issues).

Anyway, I have never tried this...
But it is VERY INTERESTING and VERY INGENUITIVE!!!

Truly AWESOME!!!

I will have to PM you and get into some more Details with you!


HOWEVER!
I have to ask...
Regarding 1982 - 1986 Models (Pump has a 0.0950" Feed Hole between the Sealing-Rings on Rear of the Stator Support Tube)...
The Reverse Input Clutch essentially has no Feed Restriction when using the 4L60E Pump.

Do you have any Harsh Reverse Engagement?



The 1993 THM700-R4 also had essentially the same configuration:
-No 0.0950" Orifice in the Reverse Input Drum.
-No 0.0950" Orifice in the Pump between the Sealing-Rings on Rear of the Stator Support Tube.

So the Feed Hole in the Valve-Body Separator Plate got a Check-Ball installed over it...
And a 0.0950" Orifice was added next to it.

The 1982 - 1986 Valve-Bodies do not have a Pocket to accommodate a Check-Ball, But...
The Separator Plate Feed Hole could be Plugged, and the 0.0950" Orifice added.

I believe there would be enough exhaust available via the Pump (exhaust there for the Reverse Boost Valve).

 

I understand drilling the Case (Pump face) for the 1987 - 1993 THM700-R4 Cores...
To have the D4 Passage that the 1982 - 1986 Cores had (removed in later Cores due to D4 Pipe being used for the added Auxiliary Valve-Body).


Obviously the 4L60E Pump does not accommodate the Pipe, but does accommodate the 1982 - 1986 Passage for D4 Fluid.

What is the "2nd feed at top right square hole in case" ?


Would you rather just discuss this via PM?
I would understand if you did!

 

I have to ask...
Regarding 1982 - 1986 Models (Pump has a 0.0950" Feed Hole between the Sealing-Rings on Rear of the Stator Support Tube)...
The Reverse Input Clutch essentially has no Feed Restriction when using the 4L60E Pump.

Do you have any Harsh Reverse Engagement?




The 1993 THM700-R4 also had essentially the same configuration:
-No 0.0950" Orifice in the Reverse Input Drum.
-No 0.0950" Orifice in the Pump between the Sealing-Rings on Rear of the Stator Support Tube.

So the Feed Hole in the Valve-Body Separator Plate got a Check-Ball installed over it...
And a 0.0950" Orifice was added next to it.

The 1982 - 1986 Valve-Bodies do not have a Pocket to accommodate a Check-Ball, But...
The Separator Plate Feed Hole could be Plugged, and the 0.0950" Orifice added.

I believe there would be enough exhaust available via the Pump (exhaust there for the Reverse Boost Valve).
[/QUOTE]
I have not noted either personally nor from customers of any issues with it being excessive. (Note all PB 700r4 the last near decade were done this way) Note the first couple were harsh as I failed to think through removal of the check ball in aux body and was still using stock spring but once that was delt with no issues,
The presure boost in reverse at idle is much lower but rises quickly with throttle I do add the wave plate to the early units.
As for forward engagement early units pre aux you really do nothing but use the pump and Block the feed on case top right its square with round hole aux units but just round in early units .
In aux units drill feed from pump to case, block square hole with round center at right front of case 1/4 check ball works perfect , Plug the tube feed hole in the aux. a 10mm ball like in the tv slot works well, Leave ball out of the aux VB or it will block feed to accum, replace accum spring with 4th gear accum spring from 4l60e.
RESULTS
1-Very nice smooth TV line rise with throttle with .500 boost valve you will see arround 200 PSI max but I add a small spring in boost valve this jumps it to about 220 max.. Idle PSI 60 to 80 typically
2- Normal Line rise in manual 1 and 2 same as d3 and d4 instead of max line .
3- The ability to use a stock deep 4l60e filter and pan No extenders or adapters
4- And best you are no longer dealing with 2 boost systems, sizes and valves
5- You can use any o ring seal style 4l60e pump from any year 93 to 2006 much easier to come by than good 700-r4 pumps
Frank

 

What kind of spring did you use? I recently installed a Sonnax boost valve (777917-500), and I was not pleased with the pressures I got.

https://ls1tech.com/forums/automatic...l#post20503877

 

This spring https://www.facebook.com/photo?fbid=281550008195642&set=pcb.281550028195640 from this kit https://www.facebook.com/photo?fbid=281549981528978&set=pcb.281550028195640 inside the rev boost valve like this hope those come through if not ill direct upload . This on any 4l60e pump with in a 700r4 or a 4l60e will yield between 210 and 225 psi max line regardless of boost valve size.

Note this is at 1800 RPM

 

Note that spring kit is at harbor freight and is 5 dollars and has many useful springs .