Kit Components

A truly complete conversion from automatic, combining the Keisler PerfectFit^TM transmission system with all of the correct matched accessory parts that have been carefully selected and tested by Keisler for guaranteed quality and performance. 

Drivetrain component selection and installation instructions and support is critical to get the job done right. Rest assured, buying from Keisler - the leader in overdrive transmission systems - is the first step in the best driving improvement you will make to your 55-57 Chevy.

1.  TRANSMISSION - NEW TREMEC T-56 (475 HP/475 LB-FT), customized by Keisler with a shift position that allows full movement of your bench seat.

• Custom short-throw internal shifter mechanism designed to provide better-than-stock shifting.
• Muncie / Borg-Warner GM bolt pattern and input shaft configuration for direct bolt-in installation.
• Gear Ratios: 2.97 1st, 2.07 2nd, 1.43 3rd, 1.00 4th, .80 5th; 0.62 6th, 3.28 reverse.
• Low RPM Cruising - 38% drop in engine RPM in 6th gear (check out our Speed Analyzer).
• Precision Assembled, TRIPLE Quality Checked - assembled at Keisler by our trained technicians; 100% inspected for function, leak and visual appearance (check us out).
• Nation-Wide Parts & Service - Parts in-stock; service in-house.

2.  PILOT BEARING - Needle Roller Bearing for long life and high capacity.

3.  ISOLATOR - Heavy-duty rubber isolator. Polyurethane upgrade available.

4.  WIRING HARNESSES - Easy coupling to factory wiring for reverse lights and reverse lockout.

5.  DRIVESHAFT - Lightweight high strength steel, automatic welded and computer dynamic balanced with premium solid sealed U-joints, painted satin black, certified and serialized. Built in-house on Hines driveshaft manufacturing cell for the ultimate in quality and craftsmanship!

6.  SLIP YOKE - Heavy duty Spicer slip yoke.

7.  BELLHOUSING - Keisler designed & manufactured reproduction of the 11 inch '621' bellhousing. Made in USA of high strength cast aluminum-titanium construction, 50% thicker wall construction than factory, CNC machined; available for all Chevy V8s and GM LS engines.

8.  BELLHOUSING INSPECTION COVER - stamped steel, black powder paint; genuine GM.

9.  FLYWHEEL - Billet steel flywheel, computer balanced.

10.  FLYWHEEL BOLTS - Grade 8+ specialty flywheel bolts; with locking washers.

11.  CLUTCH KIT - Modern pedal effort diaphragm Performance Clutch Kit incl: computer balanced pressure plate, premium sprung hub Clutch Disk (with latest technology environment friendly friction material), sealed release bearing, lube pack.

12.  CLUTCH BOLTS - Grade 8+ specialty clutch bolts.

13.  PEDAL KIT - New reproduction clutch pedal assembly with rubber pad.

14.  MECHANICAL CLUTCH ACTUATOR LINKAGE KIT(Original Type) - clutch pedal pushrod, z-bar, return linkage, springs, clips, pivot ball (if required), frame bracket for pivot ball.

14(opt).  OPTIONAL HYDRAULIC CLUTCH ACTUATOR KIT (Modern Type, Recommended) - OEM reliability, high quality exclusive Keisler design; easier pedal effort than mechanical type; installs much easier than mechanical actuator, with no linkage required; includes: 1) quick release master cylinder with ball joint and adjustable push rod, 2) single stainless steel line-set with bleeder fitting, 3) high tech OE grade concentric self-centering double-sealed hydraulic release bearing (rated at 7000 RPM), 4) bellhousing dust cover & line bracket, 5) remote clutch reservoir with fluid baffle, molded cap, 6) DOT approved low pressure line, and 7) installation instructions.

15.  SHIFT HANDLE  - High quality chrome shift handle and ball, for bench or bucket seats.

16.  SHIFTER BOOT AND TRIM RING - Molded rubber accordion style boot with chrome trim ring.

17.  INSTALLATION HARDWARE KIT - High strength Grade 5 and 8 fasteners, properly sorted, bagged and labeled for easy reference.

18.  INSTALLATION MANUAL - Highly illustrated step-by-step instruction manual.

19.  6 MONTH WARRANTY - 2 years to activate (in case you are restoring a car)! Extended warranty available at extra cost. Best Customer Support in the Industry.

100% Customer Satisfaction Guaranteed

• The best Customer and Tech Support in the industry
• Lifetime Tech Support from our premier experienced staff

Overview-Ordering

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The Keisler PerfectFit™ System is the easiest and most complete way to put a high strength, modern overdrive Tremec T56 6-speed double-overdrive transmission in your 1955-1957 Chevy Bel Air. Our Keisler Custom Engineered Front Shift conversion provides the smoothest operation, the shortest throws and the optimal fit for your 1955-57 Chevrolet with no modifications to the original bench or custom bucket seats. Enjoy a PerfectFit transmission with low RPM cruising and great fuel economy today.

Unsurpassed quality of design, components and build are included with every Keisler PerfectFit™ System.  Enjoy low RPM cruising and fun shifting, while getting the benefits of reduced engine wear and tear.  Join thousands of customers that say "The Keisler PerfectFit™ Transmission System is the Best Upgrade for your 1955-57 Chevy."

Speed Analyzer

Testimonials

Recent Testimonials...

Pat Johansson - '57 Chevy

Thanks Jeff and Keisler,
From a happy customer in Sweden...I went for a weekend trip to Norway, about a 12 hour trip to break in the gear box. Due to the 5-gear this was possible (big block and 4.10 rear axle) and something that was a big bonus, driving down the mountains, I could downshift to a lower gear and not overheat the rear drum brakes.  It's so fun to drive this stickshift car and maybe I take it to the track in late August and see if I can improve the quarter mile run. It feels like 700hp when I drive the car!!  The engine makes about 560-580 after upgrade.
Best regards,
Patrik