Kit Components

A truly complete conversion combining the Keisler PerfectFit^TM transmission  with all of the correct matched 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 TKO-600 (600 HP/600 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: 2.87 1st, 1.89 2nd, 1.28 3rd, 1.00 4th, .64 5th; 2.56 reverse.
• Low RPM Cruising - 36% drop in engine RPM in 5th 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.  BACK-UP LIGHT WIRING HARNESS - Easy coupling to factory wiring.

5.  NEUTRAL SAFETY START SWITCH - Can be wired into your starter circuit if desired.

6.  SPEEDOMETER CABLE & DRIVEN GEAR - Mechanical speedometer cable and correct driven gear PLUS integrated 2-wire electronic output included. Optional electronic wiring harness also available (for use with electronic speedometers or EFI).

7.  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!

8.  SLIP YOKE - Heavy duty Spicer slip yoke.

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

10.  TUNNEL SHEETMETAL - Replacement sheetmetal pre-cut to the correct size and shape is provided.

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

12.  3 YEAR 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 TKO 5-speed transmission in your 1955-1957 Chevy Bel Air with automatic transmission. Our Keisler Custom Engineered PerfectShift™ Tailhousings and Shift Mechanisms provide 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