We at Rhodes Engines have such confidence in the JASPER name, quality and workmanship that we started installing their transmissions shortly after our first JASPER Engine installation in 1992.  You can relax knowing that our team of technicians with 60 years of experience and that JASPER remanufactured automatic and standard transmissions are designed for your peace of mind and are backed by a warranty that shows just how good their transmissions are!  3 YEARS | 100,000 MILES PARTS & LABOR NATIONWIDE WARRANTY.

You don't have to worry about your bill growing as more and more parts need to be machined or replaced, comb the junkyards for a used transmission, or trust your fate to a 30 day warranty transmission.  You will have a great transmission - installed by a team of professionals and backed by a 3 YEAR | 100,000 MILE WARRANTY. 

All JASPER Transmissions are..

  • Dynamometer Tested 
  • Remanufactured to Meet or Exceed New OEM Factory Specifications
  • NO Surprises & Additional Costs!
  • JASPER Remanufactured Torque Converter Included
  • All Updates in Writing Unlike Competition

Why JASPER Reman Transmissions?

If the transmission in your vehicle fails, you as an individual or business are faced with a very important decision as to the repair options available to you. The question of how much it will cost generally comes to mind. The more important question, though, should be, “What should I do to get the best value for the money I spend?”

We, at times, focus too much on price, even if it is a small purchase, but find that the product does not meet the expectations we had for it. We become dissatisfied with our purchase and might even wind up spending more of our hard-earned money in order to get what we really needed to purchase the first time.

A purchase decision based on value is especially important when considering a major vehicle repair like a transmission replacement. This is the car, truck, van or SUV that your family or business depends on to carry out its day to day activities. Your vehicle is definitely one of the things you do not want to have an early failure.

Instead, you can purchase a completely reman JASPER transmission and get back on the road worry-free.

When you make the decision to purchase a JASPER remanufactured transmission, you’ve made a value-based decision based. JASPER reman transmissions are built to the highest quality standards in the industry. JASPER automatic transmissions are live-run dynamometer tested to be sure that they meet and perform to your expectations in order to provide thousands of miles of reliable service. Your family or business can depend on remanufactured transmissions from JASPER for peace of mind driving.

Custom Transmission Needed?  No Problem

The staff of JASPER Authentic Custom Drivetrains, a division of Jasper Engines and Transmissions, understands the pride and satisfaction that our customers have in the ownership of a classic vehicle.

JASPER offers custom “days gone by” remanufactured transmissions for your special project. The transmissions include: Borger Warner Three Band, C4s, Dual Range, Dynaflow, Ford-O-Matics, Hydramatics, Jetaways, Jensens, Roto Hydramatics, Powerglides – cast and aluminum, PowerFlights, and more.

The Authentic transmissions can be found in Buicks, Cadillacs, Chevys, Chryslers, DeSotos, Dodges, Fords, Hudsons, Kaisers, Lincolns, Mercurys, Nashes, Oldsmobiles, Plymouths, Pontiacs, Ramblers and Studebakers.

Being founded in 1942, JASPER grew up with the transmissions that enter the doors of the JASPER Authentic Custom Drivetrain division.  At Rhodes Engines we work with quite a few custom renovation projects and that attention to detail is one of the reasons we chose JASPER products.  Read More Here



JASPER can offer this beefy warranty on our remanufactured automatic and standard transmissions because every one of them goes through our extensive "Do It Right" process that ensures worry-free operation.


Every JASPER reman transmission is thoroughly disassembled then cleaned to remove contaminants that result in premature wear to gears, bearings, shafts and other precision components like the valve body. Transmission cleaning includes individual component hand washing. Parts are carefully inspected and bushing surfaces are polished to a microfinish for extended bushing life.


As transmission technology advances, the need to maintain exacting tolerances becomes increasingly important. JASPER’s thorough inspection and precise machining processes are critical to assure proper operating pressures and provide for a long service life from your JASPER Remanufactured Transmission. Examples of JASPER’s machining processes include:

  • Case and valve body resurfacing along with profilometer inspection of shaft finish that enable JASPER to maintain exact standards and precise tolerances in all phases of transmission remanufacturing.
  • The front pump and gears are carefully gauged and, if exact tolerances are not met, machined to assure they meet our high standards and precise operation.
  • Updates to specific transmissions such as the 5R110 for which JASPER installs a machine-in-place bushing in the pump housing to provide correct alignment between the pump housing and converter hub.​


Torque converters are cut open to allow for thorough cleaning, accurate inspection and the replacement of washers, spacers, springs, rollers, and a new or re-lined lock-up clutch piston as applicable. Turbine fins are inspected and retightened and welded on specific applications. Hubs are carefully inspected and replaced. Converters are pressure tested then dynamically balanced to eliminate vibration that could cause noise, leaks or transmission damage.


Valve bodies are disassembled, cleaned and remanufactured by skilled technicians. All components of the valve body are inspected for wear and the valve body is resurfaced for correct mating and sealing with the transmission case.


Valve bodies are tested on an Answermatic test unit which simulates actual vehicle operation. Vehicle speed and driver demand are varied hydraulically. The Answermatic quickly locates cracks and imperfections and verifies accurate shift points.


Transmission performance is pre-inspected at the assembly station to assure correct operation before additional assembly and testing is performed. Pressurized fluid and special fixtures are used to test circuit leakage.


JASPER remanufactured transmissions receive a standard set of new and qualified parts. Our standard parts replacement assures smooth, consistent performance and long unit life. JASPER remanufactured transmissions are assembled by skilled technicians many of whom are ASE Certified and who specialize in particular models or families.


Every JASPER domestic automatic reman transmission is dynamometer tested with recorded inspections to shift patterns and shift pressures. A stall test, fluid leak test, lockup test (as applicable) and park test are performed. Tests are made at varying RPM's and at full and closed throttle positions. Standard transmissions are tested at the work station for proper gear engagement as well as for gear and bearing noise and proper engagement of the shift rails into the detents.


Consistent quality is maintained through a continuous training program of ASE technicians backed with statistical process control. Technicians are also JASPER Certified to specific transmissions and job functions. Weekly disassembly of a production transmission is also performed. All areas of the transmission are scrutinized for cleanliness, surface finish quality, lubrication, clearance and wear patterns.


Install JASPER with confidence. Every JASPER remanufactured transmission is backed by a nationwide warranty. Transmissions for passenger cars and trucks receive 3 year/100,000 mile parts and labor coverage. A technical hotline (1-800-827-7455) and 24 hour 7 day emergency warranty information are also available.

Rhodes Engines - family owned and professional transmission specialists in the St Louis Metro area. 

In business since 1992, Rhodes Engines located in the St Louis Metro area with an A+ BBB rating and a reputation for courteous and respectful service.   Rhodes Engines specializes in engines and transmission replacements.  As one of JASPER Engines largest installers Rhodes Engines has received top honors and awards for quality work and trouble-free installations year after year with numerous awards.  Take advantage of our 60+ years of experience in engine & transmission replacements by calling us or stopping by the shop at 531 Little Hills Industrial Blvd, St. Charles, MO 63301. 

Phone:  (636) 925-8526  |  OPEN: Weekdays 8:30 AM – 5:00 PM

Rhodes Engines

location small531 Little Hills Industrial Blvd
St Charles, MO 63301

CALL:  (636) 925-8526


Shop Hours

Weekdays:   8:30 AM - 5:00 PM
Saturdays: CLOSED