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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2009 Posts: 58 New Guy | | New Guy Joined: Mar 2009 Posts: 58 | I'm near welding in the motor mounts on my 350. My floorboard is against the trans. Bellhousing. It's just touching at the top. Is that a problem? Can't get the front of the engine lower because the balancer is 1/2" from the Power Steering. Running a Fan Clutch and Fan so I wanted to get the engine as far back as possible. (I have 2 degrees neg. on the Balancer so the Differential Pinion can be set at 0 degrees) Will noise transfer into the cab with the floor touching the transmission?
| | | | | Joined: Jun 2010 Posts: 188 Shop Shark | | Shop Shark Joined: Jun 2010 Posts: 188 | Oh Ya!! You'll get a nice drumming vibration from the contact.
Either grind off the contact point on the bell or massage the firewall with a BFH. | | | | | Joined: Dec 2008 Posts: 319 Shop Shark | | Shop Shark Joined: Dec 2008 Posts: 319 | Yes, it's a problem, and yes, noise will be transferred.
Move engine forward/down, or move floor up/back.
cm
If you can't fix it with a hammer and screwdriver, you need a bigger hammer.1965 Chevy C10 | | | | | Joined: Mar 2005 Posts: 576 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 576 | Yup....I raised the rear of my TH350 with a 1" spacer to zero out my carb base..Also to gain some distributor/firewall clearance....yes, mines rubbing also.I need to take a wizzwheel and do some trimming.......dave
1949 Chevrolet 3100 "When this thing hits 88 miles an hour, you're going to see some serious sh%t." -Doc Brown
| | | | | Joined: Feb 2004 Posts: 29,836 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,836 | You'll need to cut/hammer/grind enough clearance into the body to not only keep it from touching when it's not running, but add a little extra room to account for engine movement when under torque. Things are going to move around a little when you step on the gas- - -usually the driver's side tries to lift a little until the flex in the motor mounts gets taken up.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Mine was touching the firewall to. I took a pair of tin snips and cut the same arch as the tranny. A little at a time. When I had the clearance, like Jerry suggested, I took my dremel tool and smoothed it up real good. Once the floor covering is in it no one will ever know. | | | | | Joined: Mar 2008 Posts: 3,750 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 3,750 | I had the same problem,I just trimmed enough (about 1/2") to gain a little clearance and as Alvin mentioned,the trans cover will 'hide' it.
1950 Chevy Advance Design 3100 in ScotlandIn the Stovebolt GalleryMore pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.
| | | | | Joined: Mar 2009 Posts: 58 New Guy | | New Guy Joined: Mar 2009 Posts: 58 | Well, as a final report, I had to move the engine forward because of the HEI Distributor being so close to the firewall; then I had the welding shop make a 3/4" thick plate which was welded over the transmission mounting surface (that raised the rear of the transmission); then I found, with the whole thing forward abit, I now have about 1/4" clearance from the bellhousing. I'll follow your suggestions and trim about 1/2" total. I did think there was a possibility of noise in the cab with the floorboard touching the transmission and you guys reconfirmed that. I'm installing a lot of sound deadening material in the cab prior to upholstery so what happens here is important. Again, thanks. | | | | | Joined: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 |
~Jim
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