gnx7

iTrader: (28)

I have an '08 alum 5.3 engine with McLeod street twin clutch (just rebuilt), Quicktime RM-8020 bellhousing, and T56 Magnum transmission I'm trying to put into my '69 Chevelle turbo project.

I'm running a 2001 Camaro small pilot bearing and I can physically see the input shaft snout leaving a light circle in the back of the crankshaft casting (deeper past the pilot bearing). There is some paint transfer from the crank to the input shaft so I know it is contacting there.

Here is the bearing I have:
http://www.swaptastic.net/images/pilot_bearing_7.JPG

I am running the steel .115" thick spacer/plate that comes with the Quicktime bellhousing.

I even removed my slave cylinder to make sure there was no binding going on there and same problem.

WTF is going on here? Everyone I talk to says this should simply be a bolt together. Quicktime, Tremec distributor, McLeod

What am I missing?

nmass399

get a measurement from the bolt facing on the transmission to the end of the input shaft and measure the bellhousing end to end.

Jeremy@RPMTransmissions

iTrader: (12)

Have you measured the crank plug depth on the 5.3? The late 5.3s never had manual transmissions behind them that I am aware of so the crank plug might not have been driven as deep as the early ones. I dont see this being a problem as long as you have the correct measurement from the flywheel mounting surface of the crankshaft and the slave cylinder mounting surface of the transmission. The Quicktime bellhousings have been known to be slightly shorter than the stock bellhousing. So this maybe contribute to your issue. If the trans mounts up flush with the bellhousing and is only putting a slight witness mark on the plug, file off a small amount of the input pilot snout and let it ride.

Jeremy@RPMTransmissions

iTrader: (12)

To add to my previous statment. You definately need to make sure there is clearance between the pilot and the crank plug or you will have shifting issues. As long as you take a little off the end of the pilot area I dont see you having much problem.

gnx7

iTrader: (28)

Thanks Jeremy...... that what it sounds like I have to do....

I was hoping there was some way around it.....

I assume it would be stupid to drill the crank hole a little deeper

Any other input?

nmass399

my stock t56 input shaft is roughly 6 1/2 inches and my 8020 bellhousing is 5 5/8 inches roughly, motor plate is 1/8'' roughly. You can check that to see if there is a large difference in one of those measurements. Jeremy is probably right about the crank plug being out further. He can help you 100x better than i can.

thesource

iTrader: (60)

Quicktime offers a spacer plate for this application or you can simply trim some off the tip of the input shaft.

lizeec

iTrader: (57)

Do not drill into the crank, there is a freeze plug in the end of the crank, that plugs the oil galley that runs through the crank.

gnx7

iTrader: (28)

I was completely kidding about drilling into the crank. I wouldn't want to screw up GM's mass production balancing either!

Surgery tmrw at zero 9 hundred. input shaft.... getting a hair cut.

gnx7

iTrader: (28)

I removed 1/8" off of the snout of the crank and put a nice bevel back on with a cut off wheel and the problem is gone.

Hopefully this info helps someone else in the future!

white01ss

iTrader: (37)

Did you mean you removed 1/8" off of the snout of the T56 input shaft?

gnx7

iTrader: (28)

Correct..... I cut 1/8" off of the input shaft tip and then put a bevel back on it.. No more issues.

I'm guessing it is related to the Quicktime bellhousing.... or maybe as others have suggested the truck crankshaft isn't machined deep enough as they never had a manual transmission in the later years.....