Skip the auto shop - Our mechanics make house calls

Q: tranny swap

asked by on

I have a 86 chevy scottsdale that is a 4x4 and it has a 3 speed manual with overdrive. i am the second owner and this truck is in pristine condition but i dont like the manual tranny. i was wondering if i could switch it to auto but still have the shifter come up through the same hole in floor just because of the fwd shifter. is there a certain kind of tranny and shifter that would bolt up to my transfer case? i really dont want to start cutting holes or tearing parts off that would devalue the truck. thanks a bunch.

My car has 104000 miles.
My car has a manual transmission.

Yes, this is in fact a common conversion that many people have about these trucks. In terms of the kind of transmission that may bolt up to your application (305 cubic inch Chevy), a Turbo H350 or Turbo H400 or even a 700R4 transmission would bolt up perfectly since these were often an option in the same truck for those years. The beauty of this would be that since there is already a hole in the floor, there should not require much modification to the floor as there should already be an existing hole there for your current shifter. One thing that you will need to check and confirm when making the swap is the drive shaft going from the transmission to the transfer case. You may need to have this modified for the proper length as they may be slightly different going from a manual transmission to an automatic. Ideally, if you could find any of the above mentioned transmissions used from another 4x4 in the same era, this would be a great fit.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Gear shift not going into gear

It sounds like your shifter assembly may be broken. I would recommend having the shifter replaced by a professional. This would require removing the steering column and a few other trim piece in order to access the bolts that mount...

Q: A mechanic came and look at my motor mounts and realize they was cracked he listed front rear side. How many exactly need changing

Hi there. Usually when one motor mount is damaged, other will follow sooner than you'd expect. This is why it is recommended to replace all motor mounts at the same time. Without being there to inspect your Buick personally, it's...

Q: My fuel filter isn't getting any gas pumped into it from the fuel line. Only about a spoon full is reaching the filter

Firstly, I would recommend cleaning the carburator if you have not done this already as this could be part of the problem. Secondly, I would recommend checking the fuel pressure to determine if your fuel pump is producing the correct...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...