Thanks Will I'd love to see the math on it. Will & Merrisa Nelle <[EMAIL PROTECTED]> wrote:
Ken, I've not done the conversion, but have become interested in doing one myself, so I have began to crunch some numbers to help me decide what exactly I want. I have developed a spreadsheet to do the math. It is still in the works as I have not set it up to calculate all the values I want. At this point though, it does give engine speed vs. truck speed. In due time I will refine it to make it user friendly and post it to the files section. The rear end conversion question comes up often, and hopefully this will be a valuable tool in helping folks make their decision. In more direct response to part of your question, I can tell you that you will have reduced power in climbing hills and pulling loads. As speed is increased, torque (which results as the force pushing your truck along) decreases. The laws of science tell us that there will most definitely be a loss in the ability to climb hills and pull loads. I can quantify that in terms of numbers, but how does it really feel, I cannot say as I've not done the conversion. I hope the chart below will give you a better idea of what speeds should be possible. Note that calculations are done for a 3.55:1 GR in the rear end, and assuming a 13" tire raduis. If you would like for me to post values with different ratios, or different tire raduis, please let me know. Will Nelle Longview, TX '51 & '53 3600 Chevy (2.94) (2.94) (1.68) (1) <- These are the stock transmission gear ratios for a 3-speed Engine RPM Reverse 1st 2nd 3rd 800 5.9 5.9 10.4 17.4 1000 7.4 7.4 13.0 21.8 1200 8.9 8.9 15.6 26.1 1400 10.4 10.4 18.2 30.5 1600 11.9 11.9 20.8 34.9 1800 13.3 13.3 23.3 39.2 2000 14.8 14.8 25.9 43.6 2200 16.3 16.3 28.5 47.9 2400 17.8 17.8 31.1 52.3 2600 19.3 19.3 33.7 56.7 2800 20.8 20.8 36.3 61.0 3000 22.2 22.2 38.9 65.4 3200 23.7 23.7 41.5 69.7 3400 25.2 25.2 44.1 74.1 3600 26.7 26.7 46.7 78.4 3800 28.2 28.2 49.3 82.8 4000 29.6 29.6 51.9 87.2 4200 31.1 31.1 54.5 91.5 -----Original Message----- From: Kenneth Cluley [mailto:[EMAIL PROTECTED] Sent: Wednesday, November 03, 2004 6:22 PM To: Chevy Trucks Subject: [old-chevy-truck] Gear Set Just wondering if anyone who has converted the AD rear end to high speed (3:55/1 I think?) can give me some feedback. Are you happy with the conversion and can you comfortably due 60-65 MPH? Has it reduced power on hills, etc. I want to try a conversion vs. the open drive shaft just to have the original look. I'm restoring a truck that won't be a daily driver but would like the luxury of taking it out on the freeway occasionally. BTW, I'm being quoted a price of appx $600 parts and labor. Thx Ken Cluley '50 3100 Deluxe Wichita Falls, TX Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: [EMAIL PROTECTED] Yahoo! Groups Links [Non-text portions of this message have been removed] Ole Chevy and GMC trucks rule! To unsubscribe, send an email (with no subject, no body, just the email), to: [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/old-chevy-truck/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
