Roto 10, Slim Jim, ST300, DynaFlow, TurboGlide

We specialize in Roto 10, Slim Jim, ST300, DynaFlow, TurboGlide and overhaul.  If it’s a non-functioning unit or basket case, please contact us to determine repair-ability.

You have seen them, a classic Buick, Pontiac or Olds in storage for years, or what you are driving today is leaking everywhere, or maybe not functioning correctly, or when you pull the pan off things don’t look so good. But you want to keep that classic car or truck "original" – right?  Some say “pull it out and stick a 350 Turbo Hydramatic.”  Converting to a different trans is a lot of work and will require creative fabrication!  We believe in originality and bringing that car or truck back to functional status as it was in the era it was produced.  

The Roto 10, Slim Jim, ST300, DynaFlow, TurboGlide are good designs but are subject to incorrect repair procedures (common), broken or cracked components due to wear, or needs required modifications to address concerns (like Roto 10 SHUTTER / STALL on stop).  I have the proper modification proceedures to correct most conditions.

Roto 10 may exhibit issues such as:

• When stopping the engine shudders, engine lugs, or engine stalls
• 2-3 bump shift
• Slippage
• Short spin up after stopping
• Shifts from 2-4 cold, shifts correctly hot
• Whirring sounds from transmission

Classic Car Restoration and Transmission Shop Owners - drop us an email if you need your customer's Roto 10 or ST300 transmission rebuilt.  Even if someone else has gone through it and the transmission is not working correctly.  We are glad to help.

Our service includes disassembly, thermal cleaning/inspection.  Inspection of bushings, valving, gears, thrust surfaces.  Reseal all, replace friction components, inspect drums, replace damaged components, correct reassembly, air test, rotation test, adjust endplay, adjust bands, and torque all fasteners to OEM spec.

NOTE: Estimates listed below are general guidelines.  Upon an initial email or phone conversation, we will send you a written estimate based on your transmission condition.  

Note: All parts are provided to you at jobber cost.  This saves you enough to offset the shipping charges and transmission remove and replace charges.  If you are using a local transmission rebuild shop, be sure to ask for an estimate that includes parts AND labor.  I believe that you will find our pricing competative or less than a local shop that does not specialize in this style transmission.   

Roto 10 and ST300 rebuild labor is $1,500 and includes thermal cleaning.  Price does not include rebuild kit, needed hard parts, added labor for bushing replacement, case repairs or excessive rust/corrosion/de-varnish correction, etc. Generally your transmission can be rebuilt for around $2,100 (plus extras, plus shipping), depending on condition of transmission.  We will work with you to make an accurate estimate determination, and help you locate good used parts when needed -- contact us for more details.

Roto 10 Used In:

Olds - 61-64
Pontiac - 61-64

ST300 Used In:

DynaFlow Used In: 

Buick 1948-1963

INTERNATIONAL CUSTOMERS - EMAIL US FOR OPTIONS!  We can help locate a suitable transmission in the USA, arrange shipping to our shop, rebuild the unit, build a shipping crate, and help with shipping to your location.   We also offer install support services for your repair shop if questions arise.

A word about keeping your Roto 10, Slim Jim, ST300, DynaFlow, TurboGlide instead of swapping the original transmission for a newer style powertrain.  We encourage maintaining originality whenever possible.  We believe it adds value, preserves history, and allows the owner to drive a vehicle of the era as it was.  We believe that any investment to maintain originality will return more than the repair investment over the cost of upgrading the powertrain to a newer version.  Contact us, we are always happy to discuss your project.  Also, be sure to check out our diagnosis help page.  

NOTE: We do not remove and replace transmissions from your vehicle chassis.  We leave that to you.  Complete transmission removal, reinstallation and refill instructions are provided in navigation above. 

Email us at info@classichydramatic.com