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The Water Cooler
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OSA Garage- Transmission advice
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<blockquote data-quote="_CY_" data-source="post: 1604355" data-attributes="member: 7629"><p>ran a 47RE on my 97 Cummins 12v for several years with zero issue. routinely yanked 25k+lb with my stock tranny. key to keeping your auto tranny alive is understanding why transmission die mated to a Cummins diesel. </p><p></p><p>a stock Cummins turbo diesel motor delivers max torque at about 1600 rpm. at that engine speed most transmissions are not spinning fast enough to produce max hydraulic pressures needed to survive loads Cummins is delivering. </p><p></p><p>under light loads, 47RE or other series auto transmission will usually not have issues. the problems starts when a serious load is applied. it's nothing for Cummins truck to yank 15k+ lbs. it'll do that and beg for more. </p><p></p><p>if you are running stock auto transmission under those type loads with a Cummins. try to keep your diesel over 2,000 rpm. it's very important NOT to accelerate when overdrive kicks in. ease off when overdrive is engaging, after overdrive is fully locked up, stomp on it. </p><p></p><p>Dave Goerends is the way to go when it's time for triple disc torque converter. then if your wallet is feeling fat and motor is putting 600+hp ... not unusual to spent $6k+ building an auto tranny that bullet proof. </p><p></p><p>best transmission survive a Cummins up to about 500hp is a manual 5sp. Since I was convinced that a Cummins 12v Turbo Diesel is the best truck on the road. And I didn't feel like spending $6k building up my auto tranny. I had to have a 5sp manual tranny. </p><p></p><p>looked into changing out 47RE to 5sp.... after I found out what a major PITA that job would be. Starting looking for a new truck.... took me 3 years to find it ... a 96 Dodge 2500 with 12v Cummins, extended cab, 5sp, 4x4 with 67k mile on the clock. </p><p></p><p>it's hard finding a super low mileage 12v Cummins 3/4 ton truck. for some reason Dodge decided 3/4 ton truck didn't need manual transmissions. something like a 25 to one ratio between auto to 5sp for 12v 3/4 ton truck. whereas it's easy to find 5sp on one ton 12v trucks.</p><p></p><p>my 96 12v is lightly bombed to about 400hp. upgraded to a single disc ceramic clutch good to about 500hp. my plans are not be go above 500hp, since I don't feel like building out my 5sp with billet parts and I don't want to break anything.</p><p></p><p>installing a clutch in a 4x4 Cummins is a major job.... mine was a PITA!!! </p><p>mine has a 5in exhaust system installed, which eats up precious space transmission needs when stabbing back in place. good thing I've got a pro transmission jack.</p><p></p><p>total cost for a new Sachs full ceramic disc clutch with throwout bearing and pilot bearing is about $350 from Orielllys. they've got to special order it. most will not know they've got access to ceramic clutches. if you order a Southbend or Valair ceramic clutch is about $650 and carries IMHO a poor warranty, very short. vs a lifetime warranty for a new Sachs Ceramic clutch</p><p></p><p>a brand new Sachs ceramic clutch (good to 500hp) from Oriellys is about half price and carry a lifetime warranty. I was told to delete this same information, when I posted it on the Cummins diesel forums.</p></blockquote><p></p>
[QUOTE="_CY_, post: 1604355, member: 7629"] ran a 47RE on my 97 Cummins 12v for several years with zero issue. routinely yanked 25k+lb with my stock tranny. key to keeping your auto tranny alive is understanding why transmission die mated to a Cummins diesel. a stock Cummins turbo diesel motor delivers max torque at about 1600 rpm. at that engine speed most transmissions are not spinning fast enough to produce max hydraulic pressures needed to survive loads Cummins is delivering. under light loads, 47RE or other series auto transmission will usually not have issues. the problems starts when a serious load is applied. it's nothing for Cummins truck to yank 15k+ lbs. it'll do that and beg for more. if you are running stock auto transmission under those type loads with a Cummins. try to keep your diesel over 2,000 rpm. it's very important NOT to accelerate when overdrive kicks in. ease off when overdrive is engaging, after overdrive is fully locked up, stomp on it. Dave Goerends is the way to go when it's time for triple disc torque converter. then if your wallet is feeling fat and motor is putting 600+hp ... not unusual to spent $6k+ building an auto tranny that bullet proof. best transmission survive a Cummins up to about 500hp is a manual 5sp. Since I was convinced that a Cummins 12v Turbo Diesel is the best truck on the road. And I didn't feel like spending $6k building up my auto tranny. I had to have a 5sp manual tranny. looked into changing out 47RE to 5sp.... after I found out what a major PITA that job would be. Starting looking for a new truck.... took me 3 years to find it ... a 96 Dodge 2500 with 12v Cummins, extended cab, 5sp, 4x4 with 67k mile on the clock. it's hard finding a super low mileage 12v Cummins 3/4 ton truck. for some reason Dodge decided 3/4 ton truck didn't need manual transmissions. something like a 25 to one ratio between auto to 5sp for 12v 3/4 ton truck. whereas it's easy to find 5sp on one ton 12v trucks. my 96 12v is lightly bombed to about 400hp. upgraded to a single disc ceramic clutch good to about 500hp. my plans are not be go above 500hp, since I don't feel like building out my 5sp with billet parts and I don't want to break anything. installing a clutch in a 4x4 Cummins is a major job.... mine was a PITA!!! mine has a 5in exhaust system installed, which eats up precious space transmission needs when stabbing back in place. good thing I've got a pro transmission jack. total cost for a new Sachs full ceramic disc clutch with throwout bearing and pilot bearing is about $350 from Orielllys. they've got to special order it. most will not know they've got access to ceramic clutches. if you order a Southbend or Valair ceramic clutch is about $650 and carries IMHO a poor warranty, very short. vs a lifetime warranty for a new Sachs Ceramic clutch a brand new Sachs ceramic clutch (good to 500hp) from Oriellys is about half price and carry a lifetime warranty. I was told to delete this same information, when I posted it on the Cummins diesel forums. [/QUOTE]
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