what is the gear ratio of a 1978 cutlass

25

Asked by Apr 22, 2008 at 06:15 PM about the 1978 Oldsmobile Cutlass

Question type: General

what is the gear ratio of a 1978 cutlass

2 Answers

44,965

See other post.

1 of 1 people found this helpful.
265

re: "What is the gear-ratio of a '78 Cutlass?" I'll assume you're talking about the rear differential, not the transmission. Not sure if they(Oldsmobile), marked the "rear-ends" the same way as they did in the mid seventies(73-77). However if they did, you'll need to safely lift the car so the rear axel. assy is about 16" off the ground. You probably dont have to absolutely do this, however since there may be some cleaning/scraping involved it makes this alot simpler. On the passenger side axel tube about 12" away(towards the tire), from the diff. housing there is a axel code stamped on the tube, facing down. It was used by Olds.(GM), in identifying manufacture, build date, ratio. You may have to scrape/brush/clean off a large area to read this, a bright light will help. An "O"(a letter,not a zero, means built by Olds.), is usually the first thing you'll see followed by a build sequence. It goes #1 - Jan., #2 - Feb. and so on. Then a letter, "A" - first week, "B" - second week and so on, so "04C", would be April, 3rd week. Not sure if they put the year of manufacture, if you see an "8" by itself most likely the year.Then a ratio code, not sure about "G" body codes, but "A" body's went something like this: A(A, B, C, D),2.56, 2.73, 2.95, 3.08, so an "A A", would be an 2.56 non-Anti-Spin "open" type diff. and so on. If it has a "C" as the first letter then it is a Anti-Spin(this is what Oldsmobile called its locking differential, and is what most people refer to as a "posi"), followed by a lets say "D", so "C D" would be a 3.08 posi. So the whole sequence may look something like: O04CCD, also look for a small aluminum tag attached to the diff. housing cover(9 o:clock bolt location), it should have the ratio, if its at the 5 o:clock position it may be a "posi" tag.

Your Answer

Oldsmobile Cutlass Experts

  • #1
    F_O_R
    Reputation
    160
  • #2
    bluRAYwhale
    Reputation
    130
  • #3
    Js08016
    Reputation
    100
View All

Related Models For Sale

Used Chevrolet Impala
536 Great Deals out of 35,326 listings starting at $900
Used Chevrolet Camaro
441 Great Deals out of 30,817 listings starting at $2,495
Used Chevrolet Monte Carlo
4 Great Deals out of 1,280 listings starting at $1,488
Used Chevrolet Corvette
187 Great Deals out of 19,862 listings starting at $2,490
Used Ford Mustang
610 Great Deals out of 36,332 listings starting at $899
Used Chevrolet Caprice
198 listings starting at $9,995
Used Dodge Charger
429 Great Deals out of 28,427 listings starting at $2,490
Used Buick Regal
177 Great Deals out of 8,845 listings starting at $4,800
Used Dodge Challenger
251 Great Deals out of 22,373 listings starting at $7,488
Used Chevrolet Malibu
985 Great Deals out of 65,991 listings starting at $1,000
Used Pontiac Grand Prix
18 Great Deals out of 2,628 listings starting at $1,450
Used Pontiac Bonneville
503 listings starting at $3,699

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.