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04-23-2011, 06:07 PM | #1 |
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does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
i was just wondering if there is a company that offers a rebuild kit for the saginaw 4 speed that would give you an overdrive 4th
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68 swb 4x4 327 4 speed |
04-23-2011, 07:13 PM | #2 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
Nothing that im aware of. You really cant just add an overdrive to a transmisson that wasnt designed to have it. Not having your 1-1 gear and replacing it with overdrive would hurt a lot in most driving. The switch from 2nd to overdrive would lug the engine a ton and render the gear almost useless. the transmission now has Granny then 1st 2nd and 3rd 3rd being 1-1 You cant just get rid of the 1-1 gear and replace it with overdrive.
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04-23-2011, 09:56 PM | #3 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
thats not what i was wanting to do i know that. I wanted a 1st through 4th change in gear sets. by that i mean changing the first gear so it isnt a granny and changing the rest accordingly where as my actual 3rd gear would become 1:1 and 4th would become something beyond that.
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68 swb 4x4 327 4 speed |
04-23-2011, 09:59 PM | #4 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
Ahh gotcha... Your best bet is to just swap to a different transmission.
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04-23-2011, 10:03 PM | #5 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
Yeah thats kind of what i have been finding out. Do they make any 4 speeds in other cars that have an overdrive 4th gear
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68 swb 4x4 327 4 speed |
04-23-2011, 10:05 PM | #6 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
To get an overdrive your going to likely end up with a 5 speed. Unless you go to an auto.
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04-23-2011, 10:09 PM | #7 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
i prefer driving a manual better. much more fun
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68 swb 4x4 327 4 speed |
04-23-2011, 10:19 PM | #8 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
There is the New Process A-833 3 speed with overdrive transmission. Some mid 80s chevy trucks had them. Its a old Chrysler design & a good transmission.
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04-23-2011, 11:40 PM | #9 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
Yup, I'm currently looking for one of those as well. NP440, GM code MY6.
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04-24-2011, 12:47 AM | #10 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
its only got 3 gears or 4 total?
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68 swb 4x4 327 4 speed |
04-24-2011, 01:20 AM | #11 | ||
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
4... one is the OD
Gary
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04-24-2011, 01:22 AM | #12 | ||
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
Quote:
Quote:
This transmission was also offered in Dodge Aspen and Plymouth Volare vehicles from the mid to late 70's as well. I would assume that the input shaft splines are different but I can't see there being something preventing it from being used on a GM. |
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04-24-2011, 03:21 AM | #13 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
In the late 60's/early 70's GM offered the full synchro Saginaw 3 speed with OD and the OD unit can be adapted to the Saginaw 4 speeds "relatively" easily. Problem is that they are getting pretty rare these days.
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04-24-2011, 02:47 PM | #14 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
so what all cars did the A-833 come in or these other transmissions with the 4th gear overdrive
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68 swb 4x4 327 4 speed |
04-24-2011, 03:54 PM | #15 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
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04-24-2011, 04:04 PM | #16 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
>>the OD unit can be adapted to the Saginaw 4 speeds<< CAR Saginaw.
Are you not talking about a 4X4 with the SM465 truck trans? You'd play hell getting the T-85 3-sp OD on the back of the SM465 and then you would probably have to use a divorced transfer case. The A-833 is the Chrysler car 4-spd used in their cars in the '60s and '70s. The A-833 OD is still a car 4-spd, but was also used in Chevy and Dodge trucks. 4th gear is still 1:1 , but is called 3rd. 3rd is regeared and called 4th as the OD. You end up with what Cableguy was explaining. With your SM465 you drive 90% of the time using 2nd, 3rd and 4th. Pretend you have an OD that is above 4th. Drive around using only 2nd, 4th and OD. The A-833 with OD has a pretty good step, but not as big and it does have a usable 1st gear. The A-833 OD probably works good in a light car, but I don't think it makes a good truck trans. The regular A-833 is unbreakable as a car trans and has good gear spacing for that. There are several on the Stovebolt forum that use the A-833 OD and claim they love it, but there are some that quietly replaced it with a 5spd. Again, you would be looking at a divorced Transfer case. Wouldn't an NV4500 4x4 5spd be a mostly bolt up conversion?
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04-24-2011, 06:37 PM | #17 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
im not sure what 5 speeds would bolt in. I am trying to find out all the info i can get about getting an overdrive. I really would like a bolt in application lol. I am currently getting 7 1/2 miles to the gallon doing 75 with 33"tires. Thats roughly 75 the tires throw off the spedo. any info on different transmissions that would bolt in is appreciated.
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68 swb 4x4 327 4 speed |
04-24-2011, 08:10 PM | #18 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
Your just flat out not going to get good mileage in a 4wd with 33 inch tires. Modern trucks with fuel injection and overdrive barely get 10-12mpg with big tires. Unsprung weight has a huge impact on the amount of power it takes to move a vehicle.
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04-24-2011, 08:48 PM | #19 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
well on the highway doing 75 i am doing about 3,000 rpms or a little more usually more. I think and overdrive would bring that down a little bit which would increase fuel mileage a little bit. I used to have a 72 2 wheel drive with a 350 and a 4 barrel quadrajet and i got 13 mpg
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68 swb 4x4 327 4 speed |
04-24-2011, 08:52 PM | #20 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
You cannot compare 2wd and 4wd. Its not apples to apples. Slow down to 65mph and see if your mileage improves any. It probably will a little bit but I wouldnt expect a huge improvement.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
04-24-2011, 09:07 PM | #21 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
well right now im in laramie wyoming for school and i graduate june 24th then i got to drive this thing home. its an 8 hour drive 530 miles im hoping to find something to help with fuel mileage so i can do 75 comfortable. since that is the speed limit. doing 65 is going to turn it into a 10 or 11 hour drive
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68 swb 4x4 327 4 speed |
04-25-2011, 07:15 PM | #22 |
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Re: does anyone offer an overdrive gear set for saginaw 4 speed with granny gear
you could put a nv4500 5 speed has granny low and overdrive they came in Chevy trucks from 93-98 it is about the same size as the sm465 the shifter is set a little further back and Advance Adapters makes a adapter kit so you can use your transfer case or you can get a np205 off of a th400 and it will bolt up.
Adapter Kit http://www.advanceadapters.com/products/pn-27-0030/ Dirty Larry and a few others in the 4x4 section have done this swap here is Larry's there is a lot of good info in here http://67-72chevytrucks.com/vboard/s...d.php?t=431033
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