Suddenly No reverse gear after burnt smell coming from tranny oil. Does this mean I need a tranny rebuild

SOURCE: 91' toyota camry won't reverse when put into gear

The cheapest initial fix would be to replace the fluid and clean the filter. Try that and see how it goes. Either way it needs to be done.

Harvey N Tawatao

• 3854 Answers
• Posted on Jan 02, 2010

SOURCE: 2004 silverado tranny acting up starting w/ 2nd

Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST.

Also note that many problems that show up as transmission issues are actually PCM or electrical, and may be external to the transmission.

Secondly, put a line pressure gauge ($55 shipped on Ebay, 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 0.500" boost valve (easy fix in pan).

1-2 shift does not happen at WOT until you let off the gas: Best case: try replacing the TPS. Middle case: leak in the 2nd gear apply circuit (servo assembly or 1-2 accumulator). Double check by using the pressure gauge and watch for a big drop when the PCM commands 2nd gear. Worst case: poor line pressure rise.

1-2 Shift shudder at WOT; delayed or abnormal 1-2 shift; There's a problem ONLY on the 1-2 shift: 1-2 accumulator piston cracked or stuck cocked in the bore. Check the yellow spring inside the accumulator housing for breakage. Also, if the accumulator housing walls are scored, the housing must be replaced. Easy fix in the pan.

1-2 shift is delayed and harsh, may not shift into OD: Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace.

Soft shifting, gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Transgo HD2-C kit fixes first two without removing trans. Seal restorer may fix last problem, but probably R&R. Also try a transmission flush with BG brand products (Firestone stocks it).

Here are the common things that may be happening to your transmission to what you have described. As for your transmission fluid being burn, that is a sign that your transmission is slipping. Your going to have to service the transmission again fluid and filter changed. Since your doing that you may want to replace the boost valve and shift servo. I did mine on my 4L60E and have over 365,000 miles so far, replacing the boost valve every 60,000 mile and it's only $45.00 and take less the 5 min to replace and the servo is around the same price. I did do the upgrade and have the corvette boost valve and servo in my transmission which helps a lot. The other thing to is B&M has a electronic shift controlled modulator you can install your self which would give you 3 settings and works great with the upgrades mentioned above.

Good luck and hope this helps, keep me posted and try not to run the transmission too long with the burnt and dirty fluid. The dirt in the fluid will cause the electronic pressure control (EPC) valve to fail and will end up causing a $2,300.00 total transmission rebuilt over a simple $190.00 up grade and maintenance.

SOURCE: won't go into reverse. only park and low gear.

This sounds like you fried the clutch pack. I suggest it is time to replace the trans or have it rebuilt.

Testimonial: "thanks"

SOURCE: my 2005 gmc sierra 2500hd will not engage reverse-

bring it to aamco for a free estimate. It might be a simple fix, or a loose conection.

SOURCE: instant NO REVERSE, Chev 700R4 tranny.

You blow out the planatarys in Reverse,having fun. Now you can pull the unit and rebuild it. You should have to do it yourself,to learn what damage you did. I mean rebuild it yourself.