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Username Post: Pilot bearing 2 sizes!?        (Topic#242343)
Beezerbob 
Silver Supporting Member
Posts: 31
Beezerbob
Loc: Georgetown
Reg: 01-21-10
05-20-10 04:25 AM - Post#1917737    

As I remember there are 2 different sizes of pilot bearings for chevy trucks !? 1965 1/2 ton . Right!?

 
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brokenspoke 
Forum Newbie
Posts: 21

Reg: 02-28-08
05-20-10 07:33 PM - Post#1918148    
    In response to Beezerbob

I remember that if the engine came from factory with a automatic, the crank took a smaller bearing if adding a standard transmission

 
Vaughn 
"12th Year" Gold Supporting Member
Posts: 14693

Loc: Colorado Springs, CO
Reg: 08-08-04
05-21-10 08:52 AM - Post#1918346    
    In response to brokenspoke

As far as I know, there is only one pilot bearing DIAMETER, but there are two different types - bronze bushing or roller bearing. You can get either at a local parts store (provided the parts counter person knows what he is doing).

Most GM and other US domestic manual transmissions (car and truck) from late 50s up into the late 70s had a pilot bearing diameter of 1/2 inch.

 
Vaughn 
"12th Year" Gold Supporting Member
Posts: 14693

Loc: Colorado Springs, CO
Reg: 08-08-04
05-21-10 09:11 AM - Post#1918363    
    In response to Vaughn

Correction:
Sidworks PM'ed me, Apparently there is a difference of .025 to .030 inch between the manual and AT trucks. I had not run across this before, but I am willing to take his word for it.

 
pctahlequah 
Contributor
Posts: 548
pctahlequah
Loc: Tahlequah, Oklahoma
Reg: 08-03-08
05-22-10 06:09 AM - Post#1918772    
    In response to Vaughn

Am I missing something? The pilot bearing slides along the input shaft to engage/disengage the clutch, right? So why would an automatic need a pilot bearing? Or are you talking about the crankshaft mains?
I don't understand what you are talking about, which isn't unusual for me.
************* Preston

'66 Chevy pick-up:Small back glass, A/C cab, LWB 454/TH400/3.08 rear
'68 Impala: SS Fastback 454/700R4/3.08 rear
'07 Suzuki Boulevard C50 805cc




Edited by pctahlequah on 05-22-10 06:22 AM. Reason for edit: No reason given.

 
Vaughn 
"12th Year" Gold Supporting Member
Posts: 14693

Loc: Colorado Springs, CO
Reg: 08-08-04
05-22-10 12:33 PM - Post#1918899    
    In response to pctahlequah

In the chevy motors - they didn't know when they were produced whether the motor would be put in front of a manual or an automatic - so all chevy cranks were drilled for a pilot bearing. Once they got to the main assembly plant, they were mated up to the flywheel/flexplate and the trans they were going to use, and then the identifying numbers were stamped into the block.

It isn't like the 472-500 Cadillac blocks, where only auto transmissions were used behind them - so these didn't have a pilot bearing drilled in these cranks at all - and it is also why it is difficult to set them up for manual transmissions.

 
pctahlequah 
Contributor
Posts: 548
pctahlequah
Loc: Tahlequah, Oklahoma
Reg: 08-03-08
05-22-10 05:41 PM - Post#1919012    
    In response to Vaughn

Ok...I get it now. You're meaning the hole drilled in the back of the crank to accept the nose of the trans shaft.

Thanks
************* Preston

'66 Chevy pick-up:Small back glass, A/C cab, LWB 454/TH400/3.08 rear
'68 Impala: SS Fastback 454/700R4/3.08 rear
'07 Suzuki Boulevard C50 805cc




 
Beezerbob 
Silver Supporting Member
Posts: 31
Beezerbob
Loc: Georgetown
Reg: 01-21-10
05-28-10 04:48 AM - Post#1921781    
    In response to Beezerbob

  • Beezerbob Said:
As I remember there are 2 different sizes of pilot bearings for chevy trucks !? 1965 1/2 ton . Right!?


Outside diameter , has to do with crank , forged , cast, ect.


 
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