overdrive

  1. LukeDM

    700R4 won’t stay in overdrive

    Howdy all. I have a 91 suburban with a 700R4 transmission that i have a few problems with. Also it may be designated as a 4L60, not positive about that. My main problem is that it won’t stay in overdrive once it warms up. After about 20 miles of highway driving, i can ease off the throttle and...
  2. 90Saburban

    4L80E or GV Overdrive for my '90 Suburban?

    Hello all - me and my 1990 R2500 Sub are new to the forum. 5.7 liter TBI, 2WD, 4.10 gears, 170,000 miles. I'd like to add overdrive to the Sub at some point in the near future. Maybe this summer if I can source all the right parts. Love the TH400 for it's rock solid dependability but I really...
  3. Wes P

    Gear Vendors (Lessons Learned for driveshaft build)

    Greetings! Some notes from my Gear Vendors experience: A Gear Vendors OD installation in a C20 (or, presumably, any regular cab, long bed, 2wd, automatic, unmodified suspension) does NOT shorten the drive shaft enough to allow conversion to a one-piece drive shaft. The GV kit comes with an...
  4. Kryptonitekid

    Driveshaft angles with Ranger Overdrive

    I am in the final stages (hopefully) of installing an Advance Adapters Ranger overdrive unit in my '80 K20. It bolts to the stock bell housing in front of the trans and transfer case (SM465 & NP205), and adds 7.5" to the drive train stack. I relocated the cross member accordingly but realized...

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