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Home » Public Forums » GMCnet » [GMCnet] How many bolts are used on the 3:21 Final drive cover
[GMCnet] How many bolts are used on the 3:21 Final drive cover [message #279403] Mon, 08 June 2015 22:30 Go to next message
BobDunahugh is currently offline  BobDunahugh   United States
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A friend is going to a salvage yard that has some Toronado's to see if he can find a 3:21. I think they came in 66, and 1967's. And wasn't it 7 bolts?Bob Dunahugh
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Re: [GMCnet] How many bolts are used on the 3:21 Final drive cover [message #279408 is a reply to message #279403] Tue, 09 June 2015 00:11 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
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Bob,

You are correct the 3.21's came in 66 and 67 Toronados, they have eight (8) cover bolts:

http://www.appliedgmc.com/products/full/926.jpg

Regards,
Rob M.

-----Original Message-----
From: Bob Dunahugh

A friend is going to a salvage yard that has some Toronado's to see if he can find a 3:21. I think they came in 66, and 1967's. And
wasn't it 7 bolts?Bob Dunahugh

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: [GMCnet] How many bolts are used on the 3:21 Final drive cover [message #279428 is a reply to message #279403] Tue, 09 June 2015 10:47 Go to previous messageGo to next message
John Biwersi is currently offline  John Biwersi   United States
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Just a friendly reminder, if the final drive is a 3.21 be sure to get the right hand output shaft.

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Re: [GMCnet] How many bolts are used on the 3:21 Final drive cover [message #279439 is a reply to message #279428] Tue, 09 June 2015 14:18 Go to previous messageGo to next message
hal kading is currently offline  hal kading   United States
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And the right hand output shaft support.

Hal Kading 78 Buskirk Las Cruces NM

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Re: [GMCnet] How many bolts are used on the 3:21 Final drive cover [message #279451 is a reply to message #279439] Tue, 09 June 2015 17:44 Go to previous messageGo to next message
larry.whisler is currently offline  larry.whisler   United States
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and the cover gasket if it's in good shape ( lol ).

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Re: [GMCnet] How many bolts are used on the 3:21 Final drive cover [message #279453 is a reply to message #279451] Tue, 09 June 2015 19:52 Go to previous messageGo to next message
powerjon is currently offline  powerjon   United States
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The 3.21 cover gaskets are no longer available unless John B would have them.

JR Wright
GMC Great Laker MHC
GMC Eastern States
GMCGL Tech Editor
GMCMHI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan

> On Jun 9, 2015, at 6:44 PM, larry.whisler wrote:
>
> and the cover gasket if it's in good shape ( lol ).
>
>
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J.R. Wright
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GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan

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Re: [GMCnet] How many bolts are used on the 3:21 Final drive cover [message #279460 is a reply to message #279453] Tue, 09 June 2015 20:44 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
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JR,

Agreed, however, making a gasket using a ball peen hammer and the cast iron flange wouldn't be to hard to make.

Regards,
Rob M.
The Pedantic Mechanic

-----Original Message-----
From: John Wright

The 3.21 cover gaskets are no longer available unless John B would have them.

JR

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: [GMCnet] How many bolts are used on the 3:21 Final drive cover [message #279466 is a reply to message #279403] Tue, 09 June 2015 21:27 Go to previous messageGo to next message
Chr$ is currently offline  Chr$   United States
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I made my own gasket.

Gasket sheet, Hammer, and El-cheap-o punch kit from Horror Fright.

The 3.21 is a planetary type, and is a wee bit noisy on cold mornings until the oil warms up.

-Chr$: Perpetual SmartAss
Scottsdale, AZ

77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"

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Re: [GMCnet] How many bolts are used on the 3:21 Final drive cover [message #279469 is a reply to message #279403] Wed, 10 June 2015 00:04 Go to previous message
BobDunahugh is currently offline  BobDunahugh   United States
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The drive-train from Glenn, and BJ's GMC is being removed now. I told John, and Teresa to bring me everything as one chunk. I need to pull the cover to determine the ratio. If it's a 3:07. They have a lead on a 3:21. Be better. I like the 3:70 for my use. But thinking of going to 4:10 in my GMC.I'm building the 455 at no charge. As I want to know why a 455 with 8,000 miles on it failed. I think the problem involved the HV pump. The bearings will tell the complete story. These engines run at low RPM's. But I want to balance it to see how close they are from GM. Their 350 miles from me. Hope to get it by Sunday.Bob Dunahugh


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