700R4 Information Thread

[Ricko1966]

@nick Transmission, Strange question ,I know. But is there any reason I can't use a 4l60e as a donor to rebuild an 85 700r4 use all the 4l60 internals ,minus pump,use the 85 valve body. I'd think that would give me a decent transmission. And 4l60E cores are lots easier to come by than 88-92 700s

 

[NickTransmissions]

@nick Transmission, Strange question ,I know. But is there any reason I can't use a 4l60e as a donor to rebuild an 85 700r4 use all the 4l60 internals ,minus pump,use the 85 valve body. I'd think that would give me a decent transmission. And 4l60E cores are lots easier to come by than 88-92 700s

You can but your 1985 unit was designed to use a drum with a 2mm forward feed orifice in the forward drum. The 87+ 700s and 4L60Es all have drums with 6mm orifices as they were designed to work with a forward accumulator circuit. So your engagement into drive would be particularly harsh, especially when the vehicle is cold (i.e. sitting overnight). The reverse drum from the 60E is backwards compatible but likely not usable as nearly 100% of them are warped on the band surface so you're buying a new one anyway.

The pump can be installed however a couple mods have to be done to make it work in the early non-aux VB 700r4 (it's easier to retro the 4L60E pump into an earlier 700r4 than a late given the aux VB feed pipe to the forward clutch circuit has to be accounted for and circuitry re-routed). All other case components gears, shell, etc are interchangeable - just keep your 700's input shaft since the 60E shaft has no worm gear for the governor.

 

[TDoc]

86 K5 700R4 3:73 gears. Did a driveway complete trans flush 2k miles ago with maxlife dex full synthetic. Shifts great! Fluid was very dark when I got the blazer. Put 2k miles on it and dropped pan. Looks great! Magnets had a decent amount of black goo but hardly anything in bottom of pan. The two little rings of clutch material in the corner are from a magnet I have outside the pan.

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@NickTransmissions
I also got the torque converter to lock. Who knows how many years and miles it’s been not locking. Now it locks in 2,3,4th. Like immediately when vacuum levels are high. Almost to the point it’s annoying. Is that ok or am I going to cause pressure wear? I hooked it to manifold vacuum.

I’m sure this trans has been rebuilt or replaced. It has the gmt400 red dip stick, not sure how to tell what year the 700r4 is, I thought the pan was leaking but it’s two of the pump bolts. I tried to stop or slow it. You can’t get the bolts out without removing or moving the transmission back.

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