Turbo 350 trans no forward gears but does have reverse

Have the car scanned by a transmission shop for transmission related fault codes (not all generic scanners will read trans codes) you may have a bad solonoid in the trans valve body?

REVERSE INHIBIT
If the vehicle exceeds 6 mph (10 km/h) in the forward direction, and Reverse (R) gear is selected, the EAT ECU switches on the low clutch timing solenoid valve in the valve block, which drains the fluid from the reverse clutch.
This function prevents the gearbox from engaging reverse gear when the vehicle is moving in a forward direction, so preventing damage to the gearbox We Are Here To Help !Donald Deane MCSE,ASE,CPO

Thats not good !
I suggest that the truck be started and warmed up a while.
Then try to drive it around a bit in the yard or where ever.
If that doesnt work out the suspected clog, then I would roll under the truck and look to see if something hasn't eatten away at the wire harness for the trans.

you have bad transmission .

be careful when changing gears into reverse and be careful while in reverse and your transmission should last but if you ride on that gear to much your transmission will fail and you will no longer have reverse in your vehicle even if you have all other gears working

whatever **** means? If the fluid level is full, then you have a trans problem. I would call a trans shop, or the shop that rebuilt it. They will know what to check/ fix.

I have a 1998 and I just confronted the same problem. It seems to take like 1 gear in reserve and like 2 gear in 1 gear. Any thoughts? I don't really it should be the transmission since it still works going forward in 2 different gears. Thanks.

The seals inside your transmission are bad and leaking by and they don't start to seal until the tranny fluid warms up and swells the seals. To temporarily fix this problem you can pour some brake fluid into your transmission fluid. This will swell the seal in the transmission and it should start working again. This is only a temporary fix however, eventually you will ned to replace or rebuild your tranny. I used this method on a turbo trans 350 and got a year of service out of it that way before I had to replace the tranny. Just do not put too much brake fluid into the tranny, I would recommend one or two capfuls to start with.

This information is from my genuine service manual. I hope it is of help.
Non-turbo
Turbo
Sedan Wagon
Type 5-forward speeds with synchromesh and 1-reverse
Transmission gear ratio
1st 3.454 3.454
2nd 2.062 1.947
3rd 1.448 1.366
4th 1.088 0.972
5th 0.780 0.738
Reverse 3.333
Front reduction gear Final
Type of gear Hypoid
Gear ratio 4.111 3.900
Rear reduction gear
Transfer
Type of gear Helical
Gear ratio 1.000 1.100
Final
Type of gear Hypoid
Gear ratio 4.111 3.900 3.545
Front differential Type and number of gear Straight bevel gear (Bevel pinion: 2, Bevel gear: 2)
Center differential Type and number of gear
Straight bevel gear
(Bevel pinion: 2, Bevel gear: 2 and viscous coupling)
Transmission gear oil GL-5
Transmission gear oil capacity 3.5 2 (3.7 US qt, 3.1 Imp qt)

better check your transfer cases i had a simul;ar problem or check torque converter

how many miles on trans? does fluid smell burnt?350 turbos are good tranneys but they do go bad. in my experance its reverse that goes out first on thies transmissions but thats not saying that it does not happen the other way either. my best guess is you need a rebuild. when you say it tries to move in forward gear that tells me that the clutches are shot. 350 turbos are worth rebuilding. its up to you.