drive line angle
Jimmy Jeep
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Can anyone tell me, with a 2.5" lift on a 64 CJ, would I have to worry about drive line angle?
drive line angle
- Thread starter Jimmy Jeep
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CJ
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If it's a properly created spring under - I don't think so. Some 2.5" lifts come with a degree shim for the rear end and may come with a Transfer Case drop spacer.
dalefan88
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mine came with shims. i have the front and rear ones in. im thinking of pulling the front ones out cause it dont come back to center like it should just to see if theres a difference.
I'm surprised they gave you shims for the front with the length of the Cjs front drive shaft. I never used them in the front , especially with a 2 1/2 in. lift.
dalefan88
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CJ
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I think you will be much happier with them pulled out of the front. Most kits don't come with them for the front end. 
dalefan88
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if i remeber right they where 2 degree shims. sorry highjacked the thread.
Im with Cj , Id remove them. I really dont think you wanna snap a pic of your front driveshaft angle for us right now. Just measured 15 in. of snow here. 6 hrs of storm left.
Just measured 15 in. of snow here. 6 hrs of storm left.
dalefan88
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the snow stopped here about a hour ago.
bobby0872r
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Here is a handy website that tells you how to check drive line angles.
Click on tech info
www.4xshaft.com
Click on tech info
www.4xshaft.com
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BajaEdition
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T case drops do nothing for you but waste money. You just spent a ton for the lift and now you want to take some of that away by dropping the tcase to cure a bit of driveline vibration? Instead you need to get a cv style driveshaft and angle your rear axle.
Tom Woods has a great reputation, and has even given me a leather jacket with his name on it to wear. But he is not the only guy on the block doing great work. Some guys on his par but cheaper are Inland driveline in Corona Ca, who I use a lot, they specialize in hot rods and race cars, so they know one off custom work and get it right the first time, and Adams Driveshaft in Henderson Nevada, there gauys are all wheelers and do great work.
I would recomend either of them for a custom driveshaft. get your measurements, tel them the amount of travel and what u joints you will be using on what end, and blamo, get a killer driveshaft.
Tom Woods has a great reputation, and has even given me a leather jacket with his name on it to wear. But he is not the only guy on the block doing great work. Some guys on his par but cheaper are Inland driveline in Corona Ca, who I use a lot, they specialize in hot rods and race cars, so they know one off custom work and get it right the first time, and Adams Driveshaft in Henderson Nevada, there gauys are all wheelers and do great work.
I would recomend either of them for a custom driveshaft. get your measurements, tel them the amount of travel and what u joints you will be using on what end, and blamo, get a killer driveshaft.
CJ
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I don't normally use Transfer Case drops either - but if the kit comes with a .5" spacer and your not changing drive shafts - I say use it.
Now if it comes with a 2" spacer - run away!
And as posted - a good cv shaft is the best, but it's not usually needed running a small lift SOA kit.
Now if it comes with a 2" spacer - run away!
And as posted - a good cv shaft is the best, but it's not usually needed running a small lift SOA kit.
bobby0872r
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I have the CV conversions on my drive shafts the rearend is angled up and the Transfer Case is dropped 4" lift can i get away with removing the spacers and putting the Transfer Case back where it goes?????
BajaEdition
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what causes driveline vibration is the fact that with a u joint on either end of a shaft, and both operating at angles, then the shaft does not turn at a constant speed as either end slows down and speeds up at different times. get over 15 degrees and it gets really rough. Dropping a T case releives the amount of change each u joint has to work as it lowers the driveline. But it does this at the expense of break over angle, and you pay a lot for breakover angle. or clearance under the Jeep
The correct way to handle this is to raise the angle of the rear pinion upward and get a drive shaft with a Double cardan (CV) joint at the tcase and regular ujoint at the axle (pinion) end, we now raise the angle of the axle till the measurements are within 1 degree of each other. then we are tuned in and will run with no vibration. OK using a hanging protractor on the pinion and the shaft, you will get a 4 to 1 return, 4 degrees on the pinion will give you 1 degree on the shaft. Measure the angle of the shaft on the shaft and the angle of the pinion by the back of the axle, They will be out of phase but it is easy to reverse the angles to figure them out.
I set my driveshafts 1 degree negative to the pinion angle.
so lets say we get a measurement on our axle, measuring at the diff cover bolts of say 30 degrees amd a shaft pf 61 degrees. we would get a 91 degree measurement which sets us 1 degree negative. just about perfect.
ok, that was simple and short, the long version is clearer, but I do not have the time to pound it out.
The correct way to handle this is to raise the angle of the rear pinion upward and get a drive shaft with a Double cardan (CV) joint at the tcase and regular ujoint at the axle (pinion) end, we now raise the angle of the axle till the measurements are within 1 degree of each other. then we are tuned in and will run with no vibration. OK using a hanging protractor on the pinion and the shaft, you will get a 4 to 1 return, 4 degrees on the pinion will give you 1 degree on the shaft. Measure the angle of the shaft on the shaft and the angle of the pinion by the back of the axle, They will be out of phase but it is easy to reverse the angles to figure them out.
I set my driveshafts 1 degree negative to the pinion angle.
so lets say we get a measurement on our axle, measuring at the diff cover bolts of say 30 degrees amd a shaft pf 61 degrees. we would get a 91 degree measurement which sets us 1 degree negative. just about perfect.
ok, that was simple and short, the long version is clearer, but I do not have the time to pound it out.
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I have the CV conversions on my drive shafts the rearend is angled up and the Transfer Case is dropped 4" lift can i get away with removing the spacers and putting the Transfer Case back where it goes?????
Take the spacers out, go for a ride down the freeway and see if it vibrates or not. Only way to know for sure.