• To ALL forum users - As of late I have been getting quite a few private messages with questions about build ups here on the forum, or tech questions about your personal project. While I appreciate the interest, sending me a private message about these topics distracts from, and undermines the purpose of having a forum here. During the day I wear many hats as a small business owner-operator and I work tirelessly to provide the absolute best service possible to you, our valued customer. When I created this forum I rounded up some of the best minds I knew so that any tech question you might have could be asked and answered by either myself or one of my highly experienced moderators, this way the next time this same question is asked the answer can be easily found and utilized by the next IH enthusiast having the same question. This allows me the freedom to run the day to day operations of the business and minimize the impact to shipments and shop activities that these distractions can cause. It is of the up most importance for me to complete the daily tasks in order to best take care of you our customer, all the while providing you a forum to get the level advice and input you have come to expect and deserve from the premier IH shop in the country.

    So with that I ask that anyone with a question about one of our build ups or a general tech question to please use the forum as it was intended. I am absolutely available by telephone to answer your questions as well but at times may direct you back to our website to better field your question or questions. Most other private messages I will be glad to answer for you.

    Thank you for your understanding.

    Jeff Ismail

5 or 6 Speed Transmisson Replacement


New member
I have a 1969 1200D AWD with the original 4 speed and transfercase with 4.10 rear gears. The current transmission desperately needs a rebuild due to excessive leaks.

Is there any manual transmission that is a replacement for the factory 4 speed that adds an extra gear or 2?

Or is it worth trying to rebuild the current one?


The only transmission with an overdrive top gear that is a bolt on to the IH SV8 engines is the Fuller T-34 aka T-494 aka code 13494. They are somewhat hard to find. Any other transmission is going to be direct drive in top gear just like what you already have. Fifth gear direct drive in a five speed is no different than 4th gear direct drive in a four speed.


Administrator & Owner
Staff member
We currently do have a T-34 5 speed overdrive transmission in stock with the matching bellhousing. They are pretty rare. Cost would be $1400 plus shipping and that includes the bell housing. See pictures. We also offer a conversion for putting a modern NV4500 5 speed with overdrive in your truck. The adapter kit for the transmission is $614.95 plus you have to source the transmission (or we can sell you one all ready to go with adapter installed). Here's a link to the kit -CPT NV4500 Adapter Kit




Administrator & Owner
Staff member
Hey Jeff,
What condition is the T-34 in? Any history on it that you could share?
Give me a call when you can. You may know the person I got it from. I don't quite remember if he had rebuilt it or not but it was sold to me as a good transmission. Looks good on the inside but you never know unless a full teardown is performed.