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Re: 4 Speed to Allison automatic conversion by George
Post New Message I don't like knocking other people offering advice, but if Marvin doesn't even know how the engine sits in a 4501 after 45+ years of these buses operation, how can he give advice?
The 8V71 sits straight in a 4501, and has since it was put in in place of the two 471s in the early Scenics.
The proper replacement trans is an Allison HT740, (4 speed) or IF there is driveline room, an HT754, (5 speed.) The 5 speed is the trans of choice, as the bus will accelerate better, and do better in the mountains. Both of these trannys are available as used, good, take-outs, for $2000-$2500 exchange. You should expect to pay a SMALL core charge, as your stick won't qualify as the core. You will also need a shifter and its related wiring/tubing, an oil cooler changeout, and a driveshaft modification. These engines use a lube oil cooler mounted on the side of the crankcase, and your new Auto trans also needs its fluid cooled. So, the original single cooler comes out, and gets replaced with a dual cooler. Then they will have to make new lines to fit...
Bottom line? Marvin's price will just about buy the parts, definitely NO labor! Sorry,
George

PS: Enter Allison Automatic Transmissions in your internet search and it will bring up a truck parts dealer in Ohio & Florida that has a BUNCH of trannys for sale with prices listed. They do duplicate their listings, but they still have plenty!
All Messages in ThreadAuthorDate
Post New Message4 Speed to Allison automatic conversion Bill 6-20-05  
  Reply to MessageRe: 4 Speed to Allison automatic conversion George 7-3-05  
  Reply to MessageRe: 4 Speed to Allison automatic conversion marvin 6-22-05  
  Reply to MessageRe: 4 Speed to Allison automatic conversion Tim Owen 7-7-05  
  Reply to MessageRe: 4 Speed to Allison automatic conversion Ed Carroll 9-10-05  
  Reply to MessageRe: 7Speed to Allison automatic conversion Lewis McCord 12-24-08  
  Reply to MessageRe: 4 Speed to Allison automatic conversion SGT Schmid 10-3-05  
  Reply to MessageRe: 4 Speed to Allison automatic conversion Jack Sexton 6-22-10  
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