New from Washington State - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mojo · 05-19-2006, 07:24 PM

I have a 1968 chevy truck. Custom 20. I need to know what type of Trany is in it. It looks like a Gm 17" spline, 10" ring....Help me some one please

jsbgump · 05-19-2006, 08:02 PM

Welcometo the board from Texas

Americanrider · 05-19-2006, 08:05 PM

Welcome aboard MOJO! The SM 420 was last used in 67's. Good chance that you have a SM 465. Here is some info.

This transmission is 12 " long and features a cast iron top cover that is retained by eight bolts. The SM465 case is of cast iron. The case itself is generously ribbed both vertically and horizontally. The SM465 (also referred to as the CH-465) has a 1-1/8" diameter, ten spline input shaft that has a stick-out of 6-1/2" from the front face of the transmission. The pilot tip of the transmission measures .588". The front bearing retainer flange measures an unusually large 5-1/8" in diameter and the bearing retainer tube is 1-3/8" in diameter. The front bolt pattern is the consistent GM Muncie / Saginaw four-bolt pattern as found on GM bellhousings and transmissions from the 1940's through the 1990's.

Specifications of the SM-465 Gear Box

The SM465 is a top loaded, top shifting truck style transmission. The 465 enjoys a very low compound gear at 6.55:1 and as such it is a popular choice for those wanting a very low crawling gear. The SM465 features power-take-off (PTO) ports on the passenger and driver sides of the case.
The shifting pattern for the 465 is in the standard "H" pattern with reverse gear being to the right side, and down. Later versions featured a fourth-gear switch for activating the cruising (lean) mode of GM Engine Control Modules. The last two years of the SM465's production saw it with an aluminum top cover.

A few of us Western WA members are going to the Monroe swapmeet tomorrow, can you join us? here is the link for info.

http://67-72chevytrucks.com/vboard/s...d.php?t=198188

Mojo · 05-19-2006, 08:07 PM

Quote:

Originally Posted by jsbgump

Welcometo the board from Texas

Thank you
Do you have any info on where I can find out anout the trany?

*bskylerj* · 05-19-2006, 11:06 PM

Welcome from Spokane, WA

krue · 05-19-2006, 11:36 PM

Welcome to the board from South Mississippi! Post your question on the Engine and Drivetrain board and you'll probably get more responses.

augie · 05-20-2006, 12:07 AM

Welcome to the site! We need more folks from WA!

1969k10stepside · 05-20-2006, 12:06 PM

Welcome to the site.

97silv5.7 · 05-20-2006, 05:45 PM

Welcome from maine

LUV2XCLR8 · 05-20-2006, 05:59 PM

From West TN

Mojo · 05-21-2006, 02:42 AM

Thank you all! Now I need to know about the rear end

Mojo · 05-21-2006, 02:45 AM

Quote:

Originally Posted by Americanrider

Welcome aboard MOJO! The SM 420 was last used in 67's. Good chance that you have a SM 465. Here is some info.

This transmission is 12 " long and features a cast iron top cover that is retained by eight bolts. The SM465 case is of cast iron. The case itself is generously ribbed both vertically and horizontally. The SM465 (also referred to as the CH-465) has a 1-1/8" diameter, ten spline input shaft that has a stick-out of 6-1/2" from the front face of the transmission. The pilot tip of the transmission measures .588". The front bearing retainer flange measures an unusually large 5-1/8" in diameter and the bearing retainer tube is 1-3/8" in diameter. The front bolt pattern is the consistent GM Muncie / Saginaw four-bolt pattern as found on GM bellhousings and transmissions from the 1940's through the 1990's.

Specifications of the SM-465 Gear Box

The SM465 is a top loaded, top shifting truck style transmission. The 465 enjoys a very low compound gear at 6.55:1 and as such it is a popular choice for those wanting a very low crawling gear. The SM465 features power-take-off (PTO) ports on the passenger and driver sides of the case.
The shifting pattern for the 465 is in the standard "H" pattern with reverse gear being to the right side, and down. Later versions featured a fourth-gear switch for activating the cruising (lean) mode of GM Engine Control Modules. The last two years of the SM465's production saw it with an aluminum top cover.

A few of us Western WA members are going to the Monroe swapmeet tomorrow, can you join us? here is the link for info.

http://67-72chevytrucks.com/vboard/s...d.php?t=198188

Thank you! What do you know about the rear end? I guess I kind of asked that but it was all jumbeled up. 17" spline....10" ring.....what did chevy put in them? any ideas?

Americanrider · 05-21-2006, 03:07 AM

Since it's a Chevy 99% chance you have a Eaton rear. Big round smooth diff cover? Time to take some pics and read through the older postings of the board. Everything you want to know has been asked before... even by me.

**N2TRUX** · 05-21-2006, 08:47 AM

Welcome to the forum Mojo...

thecatseye66 · 05-22-2006, 02:56 PM

Welcome from Spokane!

**Canadian694x4** · 05-24-2006, 07:21 PM

To The Boards MOJO From Brian Of Olds...Alberta, Canada.

05-19-2006, 07:24 PM	#1
Mojo Registered User Join Date: May 2006 Location: Northport Posts: 4	New from Washington State I have a 1968 chevy truck. Custom 20. I need to know what type of Trany is in it. It looks like a Gm 17" spline, 10" ring....Help me some one please

05-19-2006, 08:02 PM	#2
jsbgump Gone Fishing Join Date: Aug 2005 Location: Fort Worth, Texas 76135 Posts: 12,361	Re: New from Washington State Welcometo the board from Texas __________________ 68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616

05-19-2006, 08:05 PM	#3
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	Re: New from Washington State Welcome aboard MOJO! The SM 420 was last used in 67's. Good chance that you have a SM 465. Here is some info. This transmission is 12 " long and features a cast iron top cover that is retained by eight bolts. The SM465 case is of cast iron. The case itself is generously ribbed both vertically and horizontally. The SM465 (also referred to as the CH-465) has a 1-1/8" diameter, ten spline input shaft that has a stick-out of 6-1/2" from the front face of the transmission. The pilot tip of the transmission measures .588". The front bearing retainer flange measures an unusually large 5-1/8" in diameter and the bearing retainer tube is 1-3/8" in diameter. The front bolt pattern is the consistent GM Muncie / Saginaw four-bolt pattern as found on GM bellhousings and transmissions from the 1940's through the 1990's. Specifications of the SM-465 Gear Box The SM465 is a top loaded, top shifting truck style transmission. The 465 enjoys a very low compound gear at 6.55:1 and as such it is a popular choice for those wanting a very low crawling gear. The SM465 features power-take-off (PTO) ports on the passenger and driver sides of the case. The shifting pattern for the 465 is in the standard "H" pattern with reverse gear being to the right side, and down. Later versions featured a fourth-gear switch for activating the cruising (lean) mode of GM Engine Control Modules. The last two years of the SM465's production saw it with an aluminum top cover. A few of us Western WA members are going to the Monroe swapmeet tomorrow, can you join us? here is the link for info. http://67-72chevytrucks.com/vboard/s...d.php?t=198188

05-19-2006, 11:06 PM	#5
bskylerj Account Suspended Join Date: Dec 2005 Location: SPOKANE, WASHINGTON Posts: 1,001	Re: New from Washington State Welcome from Spokane, WA

05-19-2006, 11:36 PM	#6
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Re: New from Washington State Welcome to the board from South Mississippi! Post your question on the Engine and Drivetrain board and you'll probably get more responses. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

05-20-2006, 12:07 AM	#7
augie Waiting for Paul to Open Safe Join Date: May 2005 Location: Everett, WA Posts: 4,570	Re: New from Washington State Welcome to the site! We need more folks from WA!

05-20-2006, 12:06 PM	#8
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,019	Re: New from Washington State Welcome to the site.

05-20-2006, 05:45 PM	#9
97silv5.7 MooMoo Join Date: Feb 2004 Location: Shapleigh, Maine Posts: 2,424	Re: New from Washington State Welcome from maine __________________ '97 ext 4x4 3" body lift and 7'6" Fisher MM2 '04 Polaris 700 twin EFI sold 2-1-07 '07 Polaris 800 twin EFI Stealth Limited Edition Support the Board! Or deal with me foo! Its all fun and games till you find out shes 16.

05-20-2006, 05:59 PM	#10
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	Re: New from Washington State From West TN __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

05-21-2006, 02:42 AM	#11
Mojo Registered User Join Date: May 2006 Location: Northport Posts: 4	Re: New from Washington State Thank you all! Now I need to know about the rear end

05-21-2006, 03:07 AM	#13
Americanrider Registered User Join Date: Dec 2004 Location: NW, WA. Posts: 1,421	Re: New from Washington State Since it's a Chevy 99% chance you have a Eaton rear. Big round smooth diff cover? Time to take some pics and read through the older postings of the board. Everything you want to know has been asked before... even by me.

05-21-2006, 08:47 AM	#14
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: New from Washington State Welcome to the forum Mojo... __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

05-22-2006, 02:56 PM	#15
thecatseye66 '68 C-20 396 CST CC Join Date: Mar 2005 Location: Spokane, WA Posts: 454	Re: New from Washington State Welcome from Spokane! __________________ 68 C-20 396/TH400 CST Custom Camper NOW W/DISC BRAKES 01 Jetta Turbo Daily Driver 84 Yamaha Virago 700 - Alaska to Florida Via Maine & Mexico

05-24-2006, 07:21 PM	#16
Canadian694x4 Born To Lose Club Join Date: Feb 2003 Location: Calgary, Alberta/Oxenden, Ontario, Great White North Posts: 13,307	Re: New from Washington State To The Boards MOJO From Brian Of Olds...Alberta, Canada. __________________ Brian Smith - "Born To Lose" 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 22 Yrs - 1 of 208 Built & Sold In Canada!- 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 3 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 17 Yrs- 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 15 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 8 Yrs - 24HP Diesel/H120/54D/260B/SB1154.

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