97 Sonoma sl 4cyl.auto. trans.slipping?
- Thread starter billfig
- Start date
Molson02536
New member
only 68kI do have a 96 S10 ls 4wd spare parts truck, are they the same & be swapable?
I think there the same generation 4L60e transmission and it was in 1998 is when the 4L60e had a few changes. As your the transmission slipping it may be a simple fix like replacing the Boost valve.
Put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.490" boost valve (easy fix in pan).
A Soft shifting, gradual performance degradation could be a poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case a leaky seals throughout the transmission. Transgo HD2-C kit fixes first two without removing trans. Seal restorer may fix last problem, but probably R&R.
If 1-2 or 2-3 shift is slow/soft above part throttle, good chance the transmission is on its way out. R&R
Good luck and keep us posted and a simple EPC valve or boost valve replacement is easier then swapping out a transmission.
Finally put on road other day. Had dtc 1870 set w/harsh 1-2. seems valve body bore wear? Then one or both cooler lines decided to spring a leak on the way homw from the carwash tonight..
Antone know options for renewing cooler lines? somebody must sell them? TIA!
Antone know options for renewing cooler lines? somebody must sell them? TIA!just a fyi..as it turned out, the TCC regulator valve bore within the valvebody was worn. I got very lucky finding another VB which already had the Sonnax valve/sleeve mod done on the VB. talk about random, I posted a wtb on CL and a guy called me 2 min. later! He also only wanted $20.00! I picked up a TransGo seperator plate and the 2 gaskets and all is working well now. I ended up using 5/16" brake line to replace both cooler lines also. Then the rear brake line blew out so I replaced/repaired that one yesterday. All in all, I'm a happy camper..
He also only wanted $20.00! I picked up a TransGo seperator plate and the 2 gaskets and all is working well now. I ended up using 5/16" brake line to replace both cooler lines also. Then the rear brake line blew out so I replaced/repaired that one yesterday. All in all, I'm a happy camper..