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Porsche 356 Transaxle Upgrades

September 26, 2010 | Troubleshooting & Repair
Tunnel Case (Types 644,716,741)

By Mike Robbins

The factory did not always make revisions at the serial number specified in technical literature. Some of these upgrades are very beneficial; others are of lesser importance.

The following table is a work in progress. If you have comments and/or additions, please email Barry Lee Brisco, Website Technical Editor, at barry.brisco@356registry.com .

Abbreviations used:
SB = Service Bulletin; SMS = Shop Manual Supplement; PC = Parts Catalog.

 

Beginning Serial # Up To Serial # Upgrade Documentation
11001 14053 Change from steel to bronze shift forks SB 14/57
11001 ? (644) Add cups for front mounts. Revise quantity and positioning of reinforcing plates. SB ?
11001 15960 Revised operating sleeve: lead angle changed. SB 31/57
11001 16744 Change intermediate plate & clamp plate: 4 bolt to 5 bolt. SB 27/57
11001 22425 Change to flanged axle nuts. -
11001 22996 Change to nose with seal for selector shaft. SB 27/58
11001 ? Change 3-4 shift fork to reinforced type. -
11001 25000 Change gears to 716 or 741 type. Improved synchronization & stronger coupling. -
11001 28722 Change from hex to "starfish" differential cover. SB 21/59
11001 32001 Offered cast iron intermediate plate. ?
11001 33188 Change to moly coated fulcrum plate. SB H1/60
11001 40102 Change to spherical fulcrum plate SB H6/60
11001 70848 Change 6-bolt to 12-bolt differential. SB H4/63
11001 END Use improved differential housing, 3 or 4 choices. Use the best you can afford. Several
11001 END Change to latest ring gear bolts. SB H4/63
11001 33183 Change to nitrided reverse shift fork. SB 36/59
32001 35001 Change to later selector shaft and shift rods (wider contact surface). PC IV/61
32001 50001 Change to revised synchro stop, brake bands & circlip. SMS
32001 51017 Use later case 741.301.101.10 (reinforced web). SMS
35001 60862 Change to later intermediate plate with oil hole. SB H1/63

2 Comments

5.may. 0007
John Wurner
November 01, 2010 at 8:17 PM
Mike<br />I have a set in good condition.<br />I sent you an e-mail via the Registry but could attach no pics, so send me a regular e-mail and I will attach pics.<br />John
5.may. 0007
John Wurner
November 01, 2010 at 8:17 PM
Mike<br />I have a set in good condition.<br />I sent you an e-mail via the Registry but could attach no pics, so send me a regular e-mail and I will attach pics.<br />John