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NP241 Strength? - not for truck

JoshHefnerX

JoshHefnerX

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Been noodling something for a bit for a project that's been on the backburner for more than a decade...
This is not for a truck.

What kind of abuse (torque) would an np241 hold up to if using the front output only. Basically the chain/sprocket section.

And, does anyone know what the spline count/diameter are on the shaft that goes into the reduction section - where it pulls out of the planetary set?
 
I was present when my buddies 241 slipped into 4 low while we were flat towing his rig down the highway at 60 mph. The 241 went up like an IED. when the smoke cleared the entire front output section of the case was gone and the complete front output/driveshaft was hanging below the rear output by the chain. The chain stayed together although it was probably stretched..if that didn't break the chain I dare say you'd be hard pressed to ever break one. I say go for it
 
Blazooki said:
I was present when my buddies 241 slipped into 4 low while we were flat towing his rig down the highway at 60 mph. The 241 went up like an IED. when the smoke cleared the entire front output section of the case was gone and the complete front output/driveshaft was hanging below the rear output by the chain. The chain stayed together although it was probably stretched..if that didn't break the chain I dare say you'd be hard pressed to ever break one. I say go for it
Click to expand...

Living proof you always pull the rear shaft...
 
JoshHefnerX said:
Been noodling something for a bit for a project that's been on the backburner for more than a decade...
This is not for a truck.

What kind of abuse (torque) would an np241 hold up to if using the front output only. Basically the chain/sprocket section.

And, does anyone know what the spline count/diameter are on the shaft that goes into the reduction section - where it pulls out of the planetary set?
Click to expand...
Tell us more of the plan...
And what kind of torque and speed

And when it goes poof boom, we want pictures
 
I would assume if the "thing" you plan to use the t-case in weighs less than a full sized truck it would probably take a lot of abuse without a whimper..
 
He's using it for a drill press with a VFD to control the speed...
 
Was thinking about using all or part of one to 'make' a transaxle for a Corvair I've got sitting in the back yard. Doing a mid-engine swap. Don't really need all of the 241 just the chain section. Running a jack-shaft to a diff mounted in the right spot, maybe a 8.8 or 9" IRS housing for it's reverse cut gearing selection.

Been looking for a while and haven't found a 'readybuilt' transaxle that I can afford. Mendeolas, RBT, Albins ect start at around 15k and go up from there.

Be an LS engine - weight of the car would be ~2800 ish wet w/ rollcage maybe...
 
Funny, I just seen a really nice corvair this weekend and thought I should get one and LS swap it.
In the front, like God Intended.

For that type of application I would be hesitant.

Drill press no.
 
I've seen guys here who build cranberry bog buggies for sanding the bogs and hauling weight ,use the front diff from a 88 up GM 4x4 truck for a right angle gear box..--that would be a cheap way to get a 90 degree heavy duty gear box--only issue is the gearing,you wont have 1:1 ratio...

I have seen several Corvairs with a V8 conversion,most of the builders used an Olds Toronado or Caddy Eldorado transaxle...
 
454Sub said:
I seen a corvair done with an LS and the 60e just bolted directly to the differential input.
Click to expand...
Not sure how well that works - using like a vette trans - puts the engine too far fwd. You got any links for that?

diesel4me said:
I've seen guys here who build cranberry bog buggies for sanding the bogs and hauling weight ,use the front diff from a 88 up GM 4x4 truck for a right angle gear box..--that would be a cheap way to get a 90 degree heavy duty gear box--only issue is the gearing,you wont have 1:1 ratio...

I have seen several Corvairs with a V8 conversion,most of the builders used an Olds Toronado or Caddy Eldorado transaxle...
Click to expand...

I've seen a few, those th425's are heavy chunks and put the engine up kinda high - and they don't have any real gearing options... Fore-aft placement is good. They are chain driven - which lead me to thinking about the np241
 
Was just doing some more reading - is the 205 actually lighter than the 241? Found sites saying 140ish for 205 and 165ish for 241..?

Anyone know anything about the Toyota rf1a - gear driven case? Seem to be more expensive - but half the weight of a 205 at about 70lbs..
 
JoshHefnerX said:
Was just doing some more reading - is the 205 actually lighter than the 241? Found sites saying 140ish for 205 and 165ish for 241..?

Anyone know anything about the Toyota rf1a - gear driven case? Seem to be more expensive - but half the weight of a 205 at about 70lbs..
Click to expand...

yeah those weights are about right, without adapters.
 
I can lift and waddle away with a NP208 & TH400 adapter I have for a spare in my garage--the NP-205 I kept out of another truck with a TH350 adapter I cant get 1" off the floor ,barely can drag the ingot around...no way does a NP241 or 208 weigh more than a NP205!..
I was kind of surprised to see many FWD transmissions use a morse chain inside to couple the diff to the transmission..
 
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