questions on tranny mod...
04-28-2005, 04:45 PM
#16
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Originally posted by apwatson50
What is the tranny called in a 92 w/O/D. I thought the 91.5-93s with the O/D were just a 727 with an overdrive bolted on the back?
What is the tranny called in a 92 w/O/D. I thought the 91.5-93s with the O/D were just a 727 with an overdrive bolted on the back?
also, how hard is it to adapt a 47rh or 47re out of the gas motor? is it a matter of changing VB and TC to fit the diesel's rpms? or are there other internals that effect it? size of gears, clutches, etc.?
thanks for the insight so far,
Pat
04-28-2005, 05:39 PM
#19
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Here is pic side by side of 727 and 518 cases, you can see how much bigger the O/D unit is, The O/D unit would be hanging into open air behind a 727 case. O/D case (518) is on the left.
http://www.pbase.com/txs/image/27313740
Pat, a v-10 would be easiest to convert to diesel, they share the same bell pattern. you would need a diesel pump and governor weights. Diesel gov weights are heavier than gas motor for lower rpm shift points and the pumps have rotors with bigger teeth for hogher volume at lower rpm than gas.
I should clarify my previous post about T/C bolting to 518, 47rh, that's only if you have a 4x4 O/D unit.
Mcmopar, I got my 48re parts from KTP, they are available from dodge, I used complete planetary set and the front and rear clutch retainers, reaction shaft support and input shaft. 48res have six pinion steel planetary carriers, heavier drive shell, maleable iron rear clutch piston retainer, true 5 plate front clutch retainer (most people call it a drum). Some even have the front clutch retainer made from maleable iron. Malable is about 3 times as strong as the regular grey cast iron tensil strength. 46 re and rh trannies do not have the cummins bolt pattern and 47 and 48 rh and re cases were only made in one bell pattern, v-10 and diesel.
http://www.pbase.com/txs/image/27313740
Pat, a v-10 would be easiest to convert to diesel, they share the same bell pattern. you would need a diesel pump and governor weights. Diesel gov weights are heavier than gas motor for lower rpm shift points and the pumps have rotors with bigger teeth for hogher volume at lower rpm than gas.
I should clarify my previous post about T/C bolting to 518, 47rh, that's only if you have a 4x4 O/D unit.
Mcmopar, I got my 48re parts from KTP, they are available from dodge, I used complete planetary set and the front and rear clutch retainers, reaction shaft support and input shaft. 48res have six pinion steel planetary carriers, heavier drive shell, maleable iron rear clutch piston retainer, true 5 plate front clutch retainer (most people call it a drum). Some even have the front clutch retainer made from maleable iron. Malable is about 3 times as strong as the regular grey cast iron tensil strength. 46 re and rh trannies do not have the cummins bolt pattern and 47 and 48 rh and re cases were only made in one bell pattern, v-10 and diesel.
04-29-2005, 07:48 AM
#20
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TXS,
How much do the parts cost, and who is KTP? I noticed the 6 pinion planetaries and the 5 disk clutch drum/retainer. Why do you use the new input shaft, I thought they were interchangeable?
How much do the parts cost, and who is KTP? I noticed the 6 pinion planetaries and the 5 disk clutch drum/retainer. Why do you use the new input shaft, I thought they were interchangeable?
04-30-2005, 12:39 AM
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Originally posted by apwatson50
What is the tranny called in a 92 w/O/D. I thought the 91.5-93s with the O/D were just a 727 with an overdrive bolted on the back?
What is the tranny called in a 92 w/O/D. I thought the 91.5-93s with the O/D were just a 727 with an overdrive bolted on the back?
Carl
04-30-2005, 09:07 AM
#22
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Mcmopar, the input and reaction shaft support have to match, there have been numerous engineering changes over the years to that pair of parts. I wanted to run a new reaction shaft support, ergo I had to run the 48re input, even though all 47re and 48re trannies are L/U and I didn't run a L/U converter, the converter rebuilder made me a non L/U converter with the L/U splines, they are one tooth different. Clear as mud? I was trying to keep expenses down and good L/U converters are a lot more than non, think I gave 90$ for mine.
http://www.pbase.com/txs/image/25689545 http://www.pbase.com/txs/image/25536263
My old truck got worked hard, but I never got anywhere near an interstate so I didn't feel like I needed L/U. I have no idea what the parts cost, ktp is kokomo transmission plant, I worked there for 33 years, retired last year.
http://www.pbase.com/txs/image/25689545 http://www.pbase.com/txs/image/25536263
My old truck got worked hard, but I never got anywhere near an interstate so I didn't feel like I needed L/U. I have no idea what the parts cost, ktp is kokomo transmission plant, I worked there for 33 years, retired last year.
05-26-2005, 06:11 PM
#23
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I installed a 47RH into my 93 about 6 months ago. I got lucky and picked up a used one out of a wrecked 95 4x4 with the bell housing adapter , flex plate, trans, and transfer case. To fit the L/U converter in the bell housing is about an inch thicker for the clutches in the Torque converter. This moves the trans back a little bit, I milled the trans mount holes out to acount for this. My transfer case bolted right up, no mods. I didn't cut the driveshafts, still plenty of room.
The four wheel drive lever took some work to fit it in there. The trans case has reenforcement webbing around the front servo. The bracket required some cutting and the handle some bending, but it fit just fine.
Hooked up the wiring and I was ready to roll. What a difference it makes going down the road.
Mike
The four wheel drive lever took some work to fit it in there. The trans case has reenforcement webbing around the front servo. The bracket required some cutting and the handle some bending, but it fit just fine.
Hooked up the wiring and I was ready to roll. What a difference it makes going down the road.
Mike
05-27-2005, 12:14 AM
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Originally posted by txs
ktp is kokomo transmission plant, I worked there for 33 years, retired last year.
ktp is kokomo transmission plant, I worked there for 33 years, retired last year.
hmmm...
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