Hey guys I could need some help to decode this tranmission. The seller told me it whas in a 1968 Camaro ? What i have is; Saginaw 4 speed 2 grooves ; 1st. 3.11 sec. 2.20 Third 1.47 fourth 1.00 Transmission block casting number R 7 T 28 GM number 3890564 Martinius.
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Sorry Martinus But I only know they made and used this fine tranny for decades and they're dead simple to overhaul , often not needing any new parts , just a good cleaning then mix and match parts from the old tranny . I had to do this on a 197? Camaro junker my buddy got cheated on , I told him to go get a guaranteed one from the local scrapyard and I'd do what I could ~ naturally they sold hi one that had totally different shifter , tail shaft housing and so on so I laid out some clean cardboard and took both apart in his upholstery shop then cleaned all the various bits , chose the best of the lot then re - assembled it and Lo ! GM & Saginaw's terrific basic design did the rest , it didn't leak and shifted great , no nose in second gear etc....... I re assembled the left over parts carefully so we got the core charge back without hassles .
Saginaw tranny! Nate I want to replace the other 4 speed in my truck as i am still not 100% content with it . It shifts very smoothly in all gears but in third and fourth gear there apears a lug sound when driving , wich i have not been able to identify where comes from ? The tranny i have bought a few weeks ago is in amazing good condition with no signs of wear at all. I will only replace parts if needed like synchros , o-rings ect. Noticed that the reverse idler gear is a bit smaller but the gear is bigger then the others i have seen , probebly because its a newer version og the Saginaw ? Alllmost identified the tranny but i am still questioning about the year the tranny whas made ? R 7 T 28 R = Saginaw 7 = T = december 28= 28 Martinius. ---------------------------------------------------------------------------------------------------------------------------------------------- 1967-1969 Camaro Transmission Code Format (except TH400 and B-W 3-speed) Trans Code Format: tymdds where: t = transmission type MANUAL AUTOMATIC S = Saginaw 3-speed A = 68/69 L6 Torque-Drive K = McKinnon 3-speed C = Cleveland Powerglide H = 69 Muncie HD 3-speed T = Toledo Powerglide R = 4-speed Saginaw B = Cleveland TH350 P = 4-speed Muncie X = Cleveland TH350 Y = Toledo TH350 y = model year (not calendar year) m = month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec --- --- --- --- --- --- --- --- --- --- --- --- A B C D E H K M P R S T dd = day of month s = suffix PowerGlide and TH350 (not used on all): D = day shift N = night shift 1969 Muncie 3-speed B = 2.42 first gear ratio 1969 Muncie 4-speed only: A = M20 B = M21 Use of the Muncie type suffix C = M22 began with 21 Oct 68 production. Examples: R7S21 Saginaw 4-speed, Nov 21, 1966 P8R01 Muncie M2x 4-speed, Oct 01, 1967 P9T11B Muncie M21 4-speed, Dec 11, 1968 C9D14N PowerGlide M35 2-speed auto, Apr 14, 1969, night shift
Saginaw Trannies Wow ; FIVE DAYS and no one here knows ths stuff ? . I'm feeling very sorry & useless right now as I can overhaul it in my sleep but I am stymied as to helping you Martinus . Sorry .
Transmission trouble shooting? Thanks fore your reply Nate. After i opened the late modell Saginaw tranny today ( 68 camaro ) i`ll noticed that all the gears are build in a better way then the earlyer models. All are helicoil cut except from the straight teeth reverse gear .The idler shaft has a stop to keep the gear in an excact position so it wont scrub the inner house sidewall when it returns back. Martinius.