Restoration & Modification Projects > Modification Projects
My Black Bitza
bfit:
Hi metal ,
I'm jumping in on Scott's thread here
Look at the original vette engine to trany setup engine angled down to the rear 3 to 3.5 deg's and angled right to left in the vehicle, ( I never measured the angle )
Diff is mounts horizontal , no drive shaft problems .
The debate on matching diff angle to engine angle is a long and ongoing.
But look at the history.
C2,C3 and 4 all have the diff mounted horizontal in the vehicle .
The matching of engine and diff angles is mainly applicable to cars with a solid rear leaf sprung axle set up as the dIf angle changes so much under acceleration bracking and corning.
Give it some thought .
Just my opinion
I run a tremec magnum in a C3 the main thing is to be make sure the rear of the gearbox is higher than the diff imput.
My engine sits at 3 deg's, diff horizontal
Consider the half shafts on the diff the yoke is horizontal in both planes.
The wheel normally runs 1 to 2 deg's camber.
How many drive shafts have you seen fail in a vette due to the variations in angles,
engine to diff , diff to wheel.
Bfit
Jethro:
Ahhh Bobby your a wealth of knowledge bro :thumb:
Scott:
I didn't settle for a specific angle as such. I just tried to get the gearbox and diff to run as parallel as I could. It's not an issue with the driveshaft failing, but more that if the angles differ too greatly, you will get a vibration in the driveline due to the way uni joints work.
When I first bolted everything in using the trans mount supplied in the kit, I had a pretty big slope on the gearbox as you can see below.
I cut the trans mount up and rewelded it 20mm higher so the gearbox was close to the floor, but not touching. I also has some spacers on the engine mounts to make everything bolt up smoothly. I removed them and did some clearancing to get the bolts to fit again and dropped the engine around 10mm.
Lastly I took 2-3mm off the front diff mount to lift the nose ever so slightly so things are fairly parallel now.
As mine was an auto swap, I didn't have an original bell housing or clutch to use. The shifter is a custom one from American Drivetrain to bring it up int eh factory location. The tailshaft is a different length also. I believe my new one is shorter than the original.
If you have any Q's, fire away.
metalhead:
Alright, thanks guys! Yes, I plan to measure the current arrangement before I remove it and align it as closely as possible to original, I'm just collecting information on what others have done before I get started. I was also considering raising the diff, so need to look at my options.
Thanks for all the tips! Hope you don't mind the thread hijack Scott.
bfit:
I don't believe you will get a vibration if
The rear of the gearbox is above the imput of the diff at least 25mm
The angle of the engine is less than 3deg's
The angle of the drive shaft is between 1.5 to 2.5 deg's
My drive shaft is going7000rpm flat out in 5th gear that's about 130 m/h
The only problem I have encounter is stopping the car Late enought to stay I front of the later modle cars
Bfit
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