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| | | | Joined: Nov 2008 Posts: 14 Apprentice | | Apprentice Joined: Nov 2008 Posts: 14 | Ok, just finished the 235 and am wanting to back it with a saginaw 4 speed, rearend is ready for the pumpkin swap and am debating on trans options, Im not looking for anything over 60MPH on the highway as im trying to keep this simple! I want the sycro first gear of the saginaw and would like to make as little modifications as possible, will all the saginaws bolt up to the 47 bellhousing I have, also using the same flywheel, clutch pplate and stomp starter to do this! Everyone I know says go t-5, well I dont want the t-5, please give any insite on this, thanks for your time!!!!!! | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | It depends on your rear end ratio. The Saginaw 4 speed is straight through in high gear so it won't give you better highway gearing. I'm getting ready to take out the Saginaw from mine & put in a T-5. The Saginaw will be for sale soon.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Nov 2008 Posts: 14 Apprentice | | Apprentice Joined: Nov 2008 Posts: 14 | You still got a rear pumpkin I can use for my 47 1/2 ton rear? if i were to use a rear pumpkin for my rear and a saginaw, would it be a decent swap? | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | I take it your 47 is the second series. We can get another pumpkin. It will probably be 3.90 gear ratio. It willrun 60 mph but will not be comfortable or get good gas mileage, unless you change to the 3.38 gears which is very expensive.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Feb 2006 Posts: 549 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 549 | I've had a saginaw in mine for a while. It's behind a V8, so I may not be helping much.
When I had a 4:10 rear, it would run ~3000RPM @ 60 MPH and ~3500 RPM at 70. Swaped to 3:38's and now am running about 2800 at 70.
| | | | | Joined: May 2005 Posts: 17 New Guy | | New Guy Joined: May 2005 Posts: 17 | Be sure to go with the cast iron 4 speed that has the mount on the rear, not the aluminum model. | | | | | Joined: Dec 2000 Posts: 506 Shop Shark | | Shop Shark Joined: Dec 2000 Posts: 506 | If you go with the cast iron saginaw 4 speed, the ideal first gear is the one with the 2 groves on the input shaft. I have a 3 grove on the back of a 235. While ok its awful long with a short second gear.
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