How to Drive an Automatic Car The primary difference between an automatic and a manual transmission is the method the car uses to shift gears.
I am attributing that to my errors with the tape measure in my haste to get mine measured so I could get back into a warm house, and I am simply using the published specs. First up, let's tackle overall length and case length.
Overall length is important for the final driveshaft length and the case length is important for the fitment to the transmission tunnel. This will require shortening the driveshaft by a matching amount, so I know that no matter what I will be paying a visit to the local driveshaft shop, which I would be doing anyway - see the section on Inputs and Output for details on why.
That means the transmission should fit nicely without any major clearance issues. This is all good news and there are no major problems to solve here.
Depending on the specific original and donor transmissions, the full length transmission is anywhere from a tad shorter to tad longer, making that part more a less a wash and a change in driveshaft length all but certain.
That leaves the location of the transmission mount pad relative to the bellhousing. This distance is important because of the transmission crossmember that holds up the back of the transmission.
Here are some pictures illustrating this. The next five pictures are of the used THR4 transmission I purchased to use in my swap with the special extension housing explained in the next section - they should give you some idea of the overall size and shape of the transmission.
The final four pictures have excellent views of the mounting pad on the case as well as the mounting pad on the special extension housing that I will be using.
In the first photo in that final group of four taken from "underneath" the rear of the transmission looking upthe case mount has two bolts loosely threaded into it and the tailshaft mount has the remains of the original transmission mount still attached to it in. The last three photos show the rear section of the transmission after I had it mounted on an engine stand in the garage and turned over for a better view.
One final note - if you decide to use an adaptor to mate your transmission to a different engine than it was intended to bolt to, make sure you find out all of the installed dimensions of the extra pieces required!
This is because the adaptor has some thickness to it - typically about an inch - and that thickness will move the entire transmission rearward by that same amount.
That moves the transmission mounting pad, decreases clearance to the transmission tunnel, and will affect the final length of your driveshaft - so double check things to make sure they still work as expected and to make sure everything fits and bolts together properly.
I did some quick measurements on my transmission crossmember, and I will be able to drill completely new holes in my crossmember at the right location using my new drill pressof course! The problem is that this will leave the mount very close to the rear of the crossmember, with some of the back edge of the mount hanging off the crossmember.
Because of this I am also contemplating doing some basic cutting, welding, and extending to make the center 6" or so of my crossmember extend another 1" or so to the rear.
A few simple cuts with the cutoff wheel combined with a few filler pieces of metal welded in place should do the trick. My first clue leading me to this solution came from a Chevy Hi Performance article on doing overdrive transmission swaps - in their "required parts" chart they list an extension housing GM part number as a required part along with a TH style transmission crossmember.
The text of the article also had more useful information. I could not find any references to that part number, so I was still a bit stumped on this one. The TH is equipped with a removable tailshaft housing that has varied in length for different vehicles over different years.
This tailshaft housing puts the mounting pad almost in line with the original TH pad and usually requires only slight elongation of the mounting holes to fit. Those searches led me to some notes for GM part number on a webpage devoted to GM installation instructions for their "over the counter" version of the 4LWrite A Short List Of Differences Between Automatic And Manual Transmission Cars [PDF] Free Keywords write a short list of differences between automatic and manual transmission cars, pdf, free, download, book, ebook, books, ebooks.
Write A Short List Of Differences Between Automatic And Manual Transmission Cars In rear wheel drive cars the transmission is almost always separate from the differential. Choosing a manual transmission or an automatic transmission is mostly a matter of personal preference.
Before you go to the dealer to buy your next new or used vehicle, it's a good idea to have a clear understanding of the . Manual transmission - once, the only option - is today an endangered species. It's either reserved for performance cars or poverty pack price leaders.
Apr 17, · While some modern automatic transmissions, i.e. CVT transmissions, manumatics, and conventional 4 or 5-speed automatic transmissions allow for some excellent acceleration, there is still usually a substantial difference in times between these types of automatics and a 5 or 6-speed manual transmission%(13).
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