herms overdrives

I was thinking about ordering one of herms overdrives. usually we only here about bad things about overdrives an not the good. how many of you out there are using them. I hope there are more good stories than bad. don't mind the $$$$$$$ if these are a product with a good track record .

thanks for any input
Harry E

Not much bad to say about an Overdrive. They really work well. You don't really go any faster but it sure calms that engine down at high speeds. The bad would be the expense and it seems that Herm is the only guy dealing with the old WARNs.

Overdrives are great but they are a completed little unit.  Saturn OD have had issues with crappy shift forks braking.  There's a reason why Herm is called the "Over drive guy"  No one knows more about them. His units are great, he also has used Warns etc. usually.  As far as used ones most of them need rebuilding which cost a few hundred bucks i parts etc. I've rebuilt my own twice and also had Herm do one. Herm knows how to really test them, as well as machine little parts to bring them back into specifications. I will be paying the pro to do it from now on. No business has a perfect record but Herm stands behind his work and is a great guy.  I've dealt with him for years.  Getting your shift linkage correct is important, a little interference can hold them from not engaging fully and this can lead to expensive pieces,.  


Edited by windyhill - 27 May 2015 at 6:26pm

I bought mine new from Walck's. Not the cheapest option but I had some gift certificates saved up that I wanted to use. It was delivered to me in 3 days. I had a couple questions during the installation and called Advanced Adapters directly. They were very friendly and helpful.

bretto wrote: If all you have is time, you can find a good used one. I spent probably 4-5 months hunting mine down but it saved me a few hundred dollars. They are out there but you really have to have a scrupulous eye to weed out the bad ones and make sure you are getting the right one.

I bought a new one from Herm last January.  I think it's mostly Advance Adapter parts (might be wrong there) but it has the bronze shift fork that some posters above thought might still be aluminum.

Edited by tamnalan - 03 June 2015 at 12:49am

I bought a used one from Herm. Saved couple hundred bucks over a new.    I have been dealing with Herm for over 7 years now.    He stands behind what he sells.    He has been burned over the years and his bed side manor can be a little rough until he gets to know you .   There is no body more knowledgable than him.    I bought the overdrive for two reasons. # 1 up in the mountains you really need the over drive betweenness gears to give you a litte better gearing.   #2. I live in Houston and yes occasionally drive my Cj3b in the highway.     Before going over an overpass I would always loose 5 to 10mph.   After I can maintain 55 to 60 without loosing any speed.    Full disclosure I have a cj3b with a Huricane so I do have a little more power than a standard Cj2a. I have purchase Koeing Winch parts, dual master cylinder upgrade kit, 11" drum upgrades, rebuilt Warn 8274 winch, misclanous parts and the overdrive from him.

Jamie,