SERVICE INTERVALS
Check fluid level at 3 month/3000 mile intervals. Draining and refilling is not required, except at time of overhaul or service.
On Corvette, change fluid in overdrive unit every 30,000 miles. On Nova, change fluid in transaxle every 20,000 miles.
CHECKING FLUID LEVEL
Check lubricant level at filler plug hole on side of transmission. Lubricant should be level with bottom of filler plug hole. Add lubricant as necessary to bring to correct level.
Note. On Camaro and Firebird, DO NOT remove reverse shift lever pin of LEFT side of case.
Isuzu & Munci 5-Speed Transaxles
- Vehicle should be on level surface. Transaxle fluid should be COLD when checking fluid. Fluid should be at "FULL" mark on dipstick. (Scheme 11) Drain plug is below dipstick tube.
- On Fiero equipped with Isuzu transaxle, remove permanent magnet generator on driver's side of case. Fluid level should be between "L" and "H" marks on generator. (Scheme 12)
Checking Fluid Level - Isuzu (Exc. Fiero) & Muncie 5-Speed. Scheme 11
Checking Fluid Level - Isuzu (Fiero) 5-Speed. Scheme 12
Toyota C51 5-Speed (Nova)
Ensure fluid level is at the bottom of the fill plug hole. (Scheme 13)
Toyota C51 Transaxle (Nova). Scheme 13
Borg-Warner 77mm 5-Speed
Use Dexron II AFT.
Doug Nash 83mm 4-Speed
Use SAE 80W-90 GL5 gear lubricant in transmission.
Use Dexron II ATF in overdrive unit.
Isuzu & Muncie 76mm 5-speed Transaxle
Use Manual Transaxle Oil (Part No. 12345349).
Toyota C51 5-Speed Transaxle
Use SAE 75W-90 or 80W-90 GL-5 gear lubricant.
FLUID CAPACITY
| Application | Pts. (L) | |
|---|---|---|
| 4-Speed | ||
| Doug Nash 83mm | (1) | |
| Overdrive Unit | 2.0 (1.0) | |
| 5-Speed | ||
| Borg-Warner 77mm | 5.9 (2.8) | |
| Toyota C51 Transaxle (Nova) | 5.5 (2.6) | |
| Isuzu 76mm Transaxle | 5.3 (2.5) | |
| Muncie 76mm Transaxle - A & P Bodies | 4.0 (1.9) | |
| Muncie 76mm Transaxle - J, L, N, & W Bodies | 5.0 (2.1) | |
| (1) Fill to bottom of filler plug hole. | ||
| (1) | Fill to bottom of filler plug hole. |
TRANSMISSION REFILL CAPACITIES
Borg-Warner 77mm Speed
Integral type shift linkage is used, and no adjustment is necessary.
Toyota C51 5-Speed Transaxle (Nova)
Shift cables are fixed length. No adjustment is provided.
Isuzu 76mm 5-Speed Transaxle (Except Fiero)
- Disconnect negative batter cable. Shift transaxle into 3rd gear. Remove lock pin at transaxle. (Scheme 14) Install lock pin with tapered end down to lock transaxle into 3rd gear.
- Loosen shift cable attaching nuts at transaxle levers. Remove console trim plate. Slide shifter boot up gearshift handle. Remove console.
- Install a No. 22 drill bit (5/32") into alignment hole on side of shifter assembly. Align hole in gearshift lever assembly with slot in shifter plate and install a 3/16" drill bit.
- Tighten cable attaching nuts at transaxle shift levers. Remove drill bits. Remove lock pin and install with tapered end up. Install console. Ensure transaxle shifts correctly.
Transaxle Shift Cables - Isuzu 76mm Transaxle (Exc. Fiero). Scheme 14
Isuzu 76mm 5-Speed (Transaxle) (Fiero)
- Disconnect negative battery cable and place transaxle in 1st gear. Loosen valve attaching nuts at transaxle shift levers. (Scheme 15)
- Remove center console for access to gearshift lever mechanism. Holding gearshift lever against left hand stop in 1st gear, install alignment pins.
- Remove free play from transaxle by rotating lever "B" in direction of arrow while tightening cable attachment nut to 20 ft.lbs. (27 N.m). DO NOT allow shift lever to move when tightening nut. (Scheme 15), View "A"
- Tighten cable "A" does not have to be rotated. Ensure reverse inhibit cam is against roller. Align if necessary.
- Remove alignment pins. Install console. When moving gearshift lever from 1st to 2nd gear, of 2nd to 1st gear, cable "B" should not move.
Transaxle Shift Cables - Isuzu 76mm (Fiero). Scheme 15
Muncie 76mm 5-Speed Transaxle (Except Fiero)
No adjustments are necessary for shift cables. (Scheme 16)
Muncie 76mm Transaxle Shift Cables (Except Fiero). Scheme 16
Muncie 76mm 5-Speed Transaxle (Fiero)
- Only shift cable is adjustable. DO NOT adjust select cable. To adjust shift cable, shift transaxle into 3rd gear. Loosen shift cable attaching nut at transaxle ball stud. (Scheme 17)
- Ensure transaxle is in 3rd gear. Remove gearshift knob and trim plates covering gearshift mechanism. Pin gearshift mechanism into 3rd gear position.
- Tighten shift cable attaching nut to 18 ft. lbs. (25 N.m.). Install trim.
Muncie 76mm Transaxle Shift Cables (Fiero). Scheme 17
Doug Nash 83mm 4-Speed Overdrive (Corvette)
1)Disconnect negative battery cable. Remove left seat. If equipped with power seats, remove electrical leads. Remove shift knob, console cover and shifter cover. Loosen lock nuts at shift rod swivels. Place shift levers in Neutral at transmission. Rods should pass freely through swivels. (Scheme 18)
2) Move gearshift lever into neutral detent. Align control assembly levers. Insert alignment gauge pin into lever adjustment slot. Tighten lock nuts at shift rod swivels at SAME TIME. Remove locating gauge pin.
3) After adjustments have been made, centerlines of shift levers must be aligns to each other to provide free crossover motion. Check transmission shift operation. Readjust as necessary. Reinstall interior in vehicle.
Gearshift Linkage Adjustment Points - Corvette 83mm 4-Speed Overdrive. Scheme 18
- Disconnect negative battery cable. Remove left seat. If equipped with power seats, remove electrical leads. Remove shift knob, console cover and shifter cover.
- Lift up adjuster locking tab on top of transmission tunnel to release cable. Position steering column lock lever in lock position. Shift transmission into reverse gear.
- Insert a .060" (1.5 mm) gauge against the lever stop and pull reverse lever until reverse pawl contacts gauge. Push down on adjusting tab to set cable. Remove gauge and pull back on shifter lever. Check that reverse pawl hits stop and locks shifter in reverse.
