What will direct swap trans? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**old Rusty C10** · 01-14-2016, 06:46 PM

I have a 74 six cylinder 3 speed on column. What trans four speed or better will bolt up directly to the bell housing and use the existing clutch etc. I do realize I will have to add a shifter

walkerb · 01-14-2016, 07:27 PM

Nv833/a833 will fit nicely

mrolds88 · 01-15-2016, 02:57 AM

Cast Iron Saginaw should swap in as a Muncie and a T10

**hatzie** · 01-15-2016, 09:36 AM

The MY6 A833 usually has a Dodge bellhousing to transmission bolt pattern unless you get one of the dual pattern transmissions. You'll probably need to match the input shaft spline count on the clutch friction disc. It's not a common transmission.

The automobile Saginaw 4 speed is a drop in with the exception of the floor shifter hole. The stick will come up right next to the seat. It's not a common transmission.

The SM465 will bolt to the bellhousing but you may have to change the friction disc to mate with the SM465 input splines... I would do that anyway once you have the transmission off. This transmission is very common.

All of them will need you to perform the driveshaft dance... except maybe the Sagniaw 4 speed.

**MikeB** · 01-15-2016, 10:31 AM

As mentioned above, a 60s-70s Muncie is the right length, and has the rear mounting holes in the right place, but make sure you know the input and output shaft spline count. As I recall, the Saginaw 3-speed has 10 in and 27 out. Most of the more common Muncie M20 wide ratio transmissions have 10 input and 27 output, but later models have 26 in, 32 out. Worst case, you'd have to get a new clutch disc and driveshaft yoke.

On another note, for those looking to convert to an auto trans, a TH350 with short (6") tail shaft is also the same length as a Saginaw 3-speed, and has 27 splines on the output shaft, so will bolt right up to the crossmember and driveshaft yoke.

**hatzie** · 01-15-2016, 01:59 PM

The TH700R4 is 27 spline too but it's longer than the TH350 or the Saginaw 3 speed

74CustomK20 · 01-15-2016, 02:31 PM

I'm going from sm465 to nv3500 and was told my couch setup would remain the same. If your for an a883 I'll have a 4x4 version soon.

**hatzie** · 01-16-2016, 01:34 PM

Quote:

Originally Posted by 74CustomK20

I'm going from sm465 to nv3500 and was told my couch setup would remain the same. If your for an a883 I'll have a 4x4 version soon.

The Saginaw 3 speed was 2wd only... He'd need the MY6 A833 not the MM7.

If you're looking to get rid of it I'd post that MM7 A833 for sale on craigslist or fleabay.

The Saginaw 3 & 4 speed, some Muncie M20 M21 M22 4 speeds, NP-A833 MY6, GM-SM465, and NV3500 use a 1-1/8" dia ten spline input shaft. They all had 27 spline output except the SM465 that has a fixed yoke output. So. The clutch disc and driveshaft will mate with all of them.
I would highly recommend replacing the clutch friction disc and the throwout bearing... and giving a critical look at the flywheel and pressure plate contact surfaces while the transmission is off. I'd probably do the rear main seal and the transmission input seal as well...

Not all Muncie M20, M21, & M22 had 10 spline in and 27 spline out. There are iterations of all 3 that had 26 spline input and 32 spline output.

The TH700R4, 4L60, & TH350 had 27 spline output yokes.
The TH400 has a 32 spline yoke.

Case lengths vary so the driveshaft is subject to modification in some cases.

01-14-2016, 06:46 PM	#1
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,279	What will direct swap trans? I have a 74 six cylinder 3 speed on column. What trans four speed or better will bolt up directly to the bell housing and use the existing clutch etc. I do realize I will have to add a shifter __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

01-14-2016, 07:27 PM	#2
walkerb Registered User Join Date: May 2010 Location: Rochester NY Posts: 831	Re: What will direct swap trans? Nv833/a833 will fit nicely __________________ 1973 k20 Suburban 350 1974 Custom stepside c-10 250 1975 Chevy stepside 454 1986 K30 Crewcab SRW 350 R.I.P- glimmertwin01- board member and good friend, you will be missed

01-15-2016, 02:57 AM	#3
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: What will direct swap trans? Cast Iron Saginaw should swap in as a Muncie and a T10 __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

01-15-2016, 09:36 AM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,941	Re: What will direct swap trans? The MY6 A833 usually has a Dodge bellhousing to transmission bolt pattern unless you get one of the dual pattern transmissions. You'll probably need to match the input shaft spline count on the clutch friction disc. It's not a common transmission. The automobile Saginaw 4 speed is a drop in with the exception of the floor shifter hole. The stick will come up right next to the seat. It's not a common transmission. The SM465 will bolt to the bellhousing but you may have to change the friction disc to mate with the SM465 input splines... I would do that anyway once you have the transmission off. This transmission is very common. All of them will need you to perform the driveshaft dance... except maybe the Sagniaw 4 speed. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

01-15-2016, 10:31 AM	#5
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,472	Re: What will direct swap trans? As mentioned above, a 60s-70s Muncie is the right length, and has the rear mounting holes in the right place, but make sure you know the input and output shaft spline count. As I recall, the Saginaw 3-speed has 10 in and 27 out. Most of the more common Muncie M20 wide ratio transmissions have 10 input and 27 output, but later models have 26 in, 32 out. Worst case, you'd have to get a new clutch disc and driveshaft yoke. On another note, for those looking to convert to an auto trans, a TH350 with short (6") tail shaft is also the same length as a Saginaw 3-speed, and has 27 splines on the output shaft, so will bolt right up to the crossmember and driveshaft yoke. __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

01-15-2016, 01:59 PM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,941	Re: What will direct swap trans? The TH700R4 is 27 spline too but it's longer than the TH350 or the Saginaw 3 speed __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

01-15-2016, 02:31 PM	#7
74CustomK20 Registered User Join Date: Oct 2014 Location: Tell City, IN Posts: 637	Re: What will direct swap trans? I'm going from sm465 to nv3500 and was told my couch setup would remain the same. If your for an a883 I'll have a 4x4 version soon. __________________ Big Nate Carp. Local 224. Buy made in the USA! 03 F350 6.0 Daily Race Truck. 79 C70 366 Project Dump.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.