Broken 4L80E Transmission

[Frank Grasha]

Well after a closer inspection and conversations w trans people seems the major overheat damage was caused by the 19 mi tow with driveshaft still connected. The overrun cluches , overdrive planetary, overrun sprag and frt clutch piston/drum, Frt pump bushings spun out ,were damaged from towing the burnt clutch plates were from original fluid loss 500 mi ago. I was hopeing to make it back home to do tear down as i have a better selection of tools and equipment  But as usual Fate had other ideas , After another $900.00 worth of parts & Tools / fluid parts cleaners etc I am Home And trans is once again working flawlessly Avg MPG from  Allegheny Valley to Valley forge was 10.2 MPG @ 60 MPH  Love 4 speeds w lockup   FI not so much i can only pull 11 in of vacuume , Quadrajet would pull 16 in  And had a lot more ommph! Though rings only have 1000 mi on them they may improve as they wear in   Frank

[Pat Daly]

Frank, it's great that you can do that type of repair. I've never overhauled an automatic trasmission and sure would like to watch someone do that sometime.  I'm very interested in various types of "fuel deliver" for older rvs to get better gas mileage, which means more trips for us!, and entended engine life. I'll watch for any of your posts on that.  Hope everything works out and you can get back to rolling dow the highways. pat

[Frank Grasha]

Re: Driveshaft explanbation was it was a short tow ??  And it was raining extremly hard at time of pickup ??  The Quadrajet primary barrells are smaller than the FI . If you can drive without ever opening the secondarys It is probably the best carb ever built Though very hard to set up properly . I still have to do some checking because wile warming up the exaust smells very rich now . But with so many other problems there has been no time for tweeking  I was able to do the repairs properly just had to duplicate a lot of stuff ! Frank

[Pat Daly]

shame you weren't closer to home so you could do it properly yourself.  Why didn't they drop the drive shaft I wonder?  Interesting on the quadrajet. I'd have thought the FI would have won out on the mpg battle.