Product Description
Fits: GM Powerglide (aluminum)
High clutch Powerpack for the GM Powerglide, made in the USA by Alto Products Corp for aluminum Powerglides in high performance and racing builds. The friction plates use Alto Red Eagle hi-performance paper, and with the Kolene coated steel plates the high gear shift is much firmer and shorter.
Specifications
| Manufacturer part number | Alto Products Corp 019755HP |
|---|---|
| Fits | GM Powerglide (aluminum) |
| Friction material | Alto Red Eagle |
| Steel plates | Kolene coated |
| Piston height after machining | .745 in (+/- .005) |
| Clutch pack clearance | .080 +/- .010 (range .060-.100) |
| Stock size steel plate | .070 in |
Installation notes
The kit uses selectively sized (thinner) friction and steel plates so the full capacity of eight (8) friction plates fits in a V-8 clutch drum. The clutch drum piston is machined (a simple procedure) and the waved cushion plate is not reinstalled. Measure from the bottom of the clutch drum (under the piston) to the sun gear flange ledge, the step approximately 3/16 in below the snap ring groove. This should be approximately 1-7/8 (1.875) in, and is much shorter in a six cylinder drum. For added durability, a wider Buick Dynaflow front pump babbit bushing can replace the narrow OEM drum bushing.
Piston: measure from the three (3) curved pads on the bottom of the piston to the top of area "A", where the first steel plate rests. An OEM V-8 piston measures approximately .860 in. Machine the top of area "A" to a height of .745 in (+/- .005).
Sun gear flange: flat sand the friction contact area with heavy grit paper, then fine paper. Plates: install the piston seals, piston, return springs, spring retainer and retainer snap ring, then one of the supplied flat steel plates, then alternate frictions and steels. The top plate is a friction.
Clearance: rest the vernier caliper or depth micrometer on the sun gear flange ledge and extend the rod until it lightly touches the top friction. Total clutch pack clearance should be .080 in +/- .010, with a recommended range of .060-.100 in. Deleting the waved cushion plate makes the high gear shift much shorter and firmer but can cause rough downshifts or spin-up on the downshift, so choose waved or no waved cushion to suit the application.
What's included
- (9) 019740A Red Eagle friction plates (.061 in / 1.55 mm)
- (9) 019701AK Kolene steel plates (.060 in / 1.52 mm)
Notes
In order to install the full capacity of eight (8) friction plates, a V-8 clutch drum must be used.
Additionally, the clutch drum piston must be machined (a simple procedure) and the waved cushion plate is not reinstalled.
Using a ruler or vernier caliper, measure from the bottom of the clutch drum to the ledge where the sun gear flange rests.
Using a vernier caliper or micrometer, measure equal distances from the three (3) individual piston pads to the top of the piston depicted in the illustration between the two horizontal lines as area “A”.
An OEM V-8 piston will measure approximately .860”.
Important Note: DO NOT machine the piston below .740”.
ALWAYS check the proximity of the first steel plate to ensure that the plate lugs are in the lugs of the clutch drum.
You will NOT be installing a waved cushion plate.
Refer to the illustrations to measure the overall clutch pack clearance.
