Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET1985BLAZER 5.0 H, STANDARD, MY6REPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONMANUAL TRANSOVERHAUL - GM 117 4-SPEEDTRANSMISSION DISASSEMBLY

1985 Chevrolet Blazer 5.0 H, Standard, MY6

Transmission Disassembly

1985 Chevrolet Blazer 5.0 H, Standard, MY6SECTION Transmission Disassembly

Mount transmission in holding fixture. Remove transmission cover assembly-to-case bolts. If required, insert 2 bolts in cover flange threaded holes and turn bolts evenly to raise cover dowel pins from case.
Move reverse shift fork so reverse idler gear is partially engaged before removing cover assembly. Remove cover assembly. Place transmission in 2 gears at once to lock gears.
Remove yoke and parking brake drum assembly (if equipped). On 4WD models, use Main Bearing Lock Nut Socket (J-35907) to remove mainshaft rear bearing lock nut. See Fig 1.
On all models, remove rear bearing retainer and gasket. Slide speedometer drive gear off mainshaft. Remove drive gear bearing retainer and gasket from case. Remove countergear front bearing cap and gasket. Pry countergear front bearing out by inserting 2-Pronged Puller (J-28509) through cast slots in case.
Remove countergear rear bearing retaining ring from countergear shaft and bearing. Using Puller (J-8433-1) with Bearing Puller (J-22832), remove countergear rear bearing. See Fig 2. Let countergear assembly rest on bottom of case.

Fig 1: Removing 4WD Mainshaft Rear Bearing Lock Nut
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.