Trans Running Hot, Not Shifting
Just joined your forum after reading Jerry’s publication on the J-MOD by way of the Mark viii.org that I’ve been with for the last year & half - I’m having trouble with the Tranny on my 95 Mark http://i1234.photobucket.com/albums/...l/_MG_0983.jpg
& could not get a conclusive answer from the other guys on what the problem might be – After reading through as much as I could on the strings on your forum covering this Trans, I find your group seems to know a lot more about the 4R70W trans issues. I wanted to get as much info as I could before asking for help.
Here’s what I’m faced with; a few months back, I was running late for an appointment & got on the freeway doing 80 – 90 mph for about 40 mi., when I got off & stopped at the signal, then started off again I couldn’t get out of 1st. gear, then I tried shifting manually & got it to shift from 1st. to 2nd. & then “D”, but would only engage sometimes – did this all the way to client location. After about an hour, got back into the car & it shifted fine, but I didn’t want to return on the freeway, so I took side streets all the way back, took over an hour, but no problem with trans shifting – Drove it the next day, about 7 mi. with no problem, but after shutting off the engine & re-starting it about 10 min. later I had the same problem again, so I manually shifted all the way back home then immediately put the Scanner on it & came up with the DTC Code 636, “Transmission Fluid Temperature Hotter that Expected” – I thought maybe the 1-2 Shift Accumulator spring finally broke & would need the upgrade I’ve been reading about. I didn’t want to drive it any more & decided to tear into the trans even though I’ve ever worked on an automatic transmission before, but there’s a first time for everything.
So I did the J-MOD, followed everybody’s instructions that had done this before, drained the pan, VB
, TC, fluid lines & radiator for a week to make sure all old fluid was gone, then followed through with Brake Cleaner & blow it all out – when I took out the 1-2 Accumulator, I found that it had already been upgraded, the piston was right, but the 2 springs were “white” & not the upper (light blue) & lower (purple) springs that you would get from the dealer (see photo)
I went ahead & replaced both the 1-2 & 2-3 Accumulator pistons & springs, TCC & TFT sensors, cleaned out & tested continuity on the SS1/SS2 solenoid & put it back in. Added a plate type fluid cooler in front, but not directly on the condenser & used 5/16” compression fittings on the fluid lines, not 3/8” rubber tubing as suggested, put the ’96 pan with dimple & rubber gasket, but some place along the line I didn’t notice the ’96 filter with the snorkel should have been used, still have the ’95 filter, then filled up on Merc V progressively – took it out for a ride & it felt great, nice chirp shifts on all gears, stopped 6 mi. down the road to pick up some supplies (10 min.), then took off again & I was right back to square one, could not shift out of 1st. while in “D”, except to shift in manual. I let the engine/trans cool off for 2 hours, then got on my way & it shifted normally all the way home?
After reading all the stuff in your forum, I see I’ve mistreated my trans by doing WOT while in “OD” & shifting through the gears in manual too much, not completely draining fluid from TC on fluid changes as well & not using Merc V.
So, with this info from your forum, I’m thinking I should have replaced the EPC & the MLPS or maybe it’s the “Direct Clutch”, “Roller Clutch Sun Gear or maybe I just fried the whole thing & need to rebuild it? BUT why would it work fine when it’s cold & not work only when I re-start it after it warms up? WHAT DO YOU GUYS THINK?