corndog
Registered User
My '92 F350 7.3 idi will shift fine when first started until it reaches operating temperature (15-20 mins.) then it refuses to shift into overdrive. Any suggestions?
4EOD SHIFT TROUBLE
- Thread starter corndog
- Start date
trackspeeder
Stone crusher.
Loss of 4th could be a few things. Low or dirty fluid. Low pressure,bad seal, a few other things. If your OD light is flashing have it scanned for codes.
david85
Full Access Member
My tranny did that to me for a while. Basically it would work like clockwork until the first real hill or hard acceleration (or up to 20 minutes if used gently), then it would not go into 4th even when the PCM commanded it. A few hours running on blocks in the shop was no problem and would pop into 4th nice and crisp everytime.
In the end I tore it down to the valve body and found the 3-4 shift valve was badly scratched. Sanding that scratch off with 600 wet sandpaper and gently sanding the bore of the valve cured the problem, but since other valves were not so easily fixed (namely the (%&(*@$ing D-2 shift valve), I had to eventually replace the whole valve body.
Do your symptoms exactly match mine?
In the end I tore it down to the valve body and found the 3-4 shift valve was badly scratched. Sanding that scratch off with 600 wet sandpaper and gently sanding the bore of the valve cured the problem, but since other valves were not so easily fixed (namely the (%&(*@$ing D-2 shift valve), I had to eventually replace the whole valve body.
Do your symptoms exactly match mine?
trackspeeder
Stone crusher.
Damaged bores would be under " a few other things". 
Sonnax offers the reamers and spools to correct those deep scratches. It makes that dreaded job of cleaning the bores really easy.
Sonnax offers the reamers and spools to correct those deep scratches. It makes that dreaded job of cleaning the bores really easy.Similar threads
