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The Terminator
Driveline
best transmission fluid for '04 cobra?
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<blockquote data-quote="highcompression" data-source="post: 14097081" data-attributes="member: 110182"><p>I know I'm dragging out a older thread, but I'd like to express my background. I've been rebuilding transmissions for -/+ 10 years now (less and less the older I get, lol). I've had a great working relationship with some of the biggest names in the business (where most of you send yours out to). Anyhow, I've done more GM and Ford T56's then I could even begin to count and this is my thought on fluids, and my personal expirences with different fluids ............</p><p></p><p>* cheaper, non synthetic, parts store brand (I know it's made by a reputable source, but to what specification ?): works well when warm, can make internal noise a little more audible then other fluids. Won't hurt a thing, and technically what Ford/Tremec recommend. </p><p></p><p>* Royal Purple: I have personally witnessed it make a non grinding trans grind. It's good stuff for the bearings, TOO slippery for the synchronizers to do their job. The factory Timkin bearings are extremely tough and will take quite a beating for 100k+ miles. It's the synchronizers and their ability to effectively "stop" the next gear, that's the key factor in this "fluid" topic. </p><p></p><p>* Mobil1: I'm a big fan of particular M1 products, have been for many years (I'm not going to get into API ratings and such .... They're the same as oils 2x their price). Always had great luck. When I do a fresh rebuild with known good synchronizers and bearings, it's the fluid of my choice and have gotten excellent feedback with customers. </p><p></p><p>* Synchromesh: excellent stuff ! About the same viscosity as ATF (approx a 30w). It's actually a pretty well engineered product. It slightly "swells" the blocker rings, thus giving you a better shift (and that equates to less internal wear). Very good choice for a trans with miles on it, or some customers have asked if it was ok with their new trans ..... Absoutely, but still prefer M1 on a fresh rebuild. </p><p></p><p>GM has been running synchromesh in their T56's since the introduction. I can personally tell you that there's no specific differences to speak of between the Ford VS GM trans, nothing that pertains to "this" topic anyway. I highly recommend GM synchromesh ! It's what I run in my personal cars. I realize that Pennzoil makes Synchromesh and is 1/2 the price .... Seems to me there IS a difference though: the color, the smell, just seems like a slightly different fluid (for the better, but I cannot confirm differences in the 2). That said I run to local GM dealer .... Again, to each their own on that one. Nothing wrong with Pennzoil's stuff though, I'd recommend it any day over a uber slippery synthetic fluid. </p><p></p><p>There's a fine line here fellas ..... You want some slick synthetics for the bearing life, but you NEED more friction to make the blocker rings do their job. The blocker rings is what gives the transmission it's "characteristics". That said, to me, those super high dollar synthetics is like this: great for bearings, horrible on blocker rings. </p><p></p><p>Food for thought. My car is going on dyno tomorrow after a long hibernation .... Plan on doing a full fluid swap on it today including Pennzoil Sychromesh in the trans.</p></blockquote><p></p>
[QUOTE="highcompression, post: 14097081, member: 110182"] I know I'm dragging out a older thread, but I'd like to express my background. I've been rebuilding transmissions for -/+ 10 years now (less and less the older I get, lol). I've had a great working relationship with some of the biggest names in the business (where most of you send yours out to). Anyhow, I've done more GM and Ford T56's then I could even begin to count and this is my thought on fluids, and my personal expirences with different fluids ............ * cheaper, non synthetic, parts store brand (I know it's made by a reputable source, but to what specification ?): works well when warm, can make internal noise a little more audible then other fluids. Won't hurt a thing, and technically what Ford/Tremec recommend. * Royal Purple: I have personally witnessed it make a non grinding trans grind. It's good stuff for the bearings, TOO slippery for the synchronizers to do their job. The factory Timkin bearings are extremely tough and will take quite a beating for 100k+ miles. It's the synchronizers and their ability to effectively "stop" the next gear, that's the key factor in this "fluid" topic. * Mobil1: I'm a big fan of particular M1 products, have been for many years (I'm not going to get into API ratings and such .... They're the same as oils 2x their price). Always had great luck. When I do a fresh rebuild with known good synchronizers and bearings, it's the fluid of my choice and have gotten excellent feedback with customers. * Synchromesh: excellent stuff ! About the same viscosity as ATF (approx a 30w). It's actually a pretty well engineered product. It slightly "swells" the blocker rings, thus giving you a better shift (and that equates to less internal wear). Very good choice for a trans with miles on it, or some customers have asked if it was ok with their new trans ..... Absoutely, but still prefer M1 on a fresh rebuild. GM has been running synchromesh in their T56's since the introduction. I can personally tell you that there's no specific differences to speak of between the Ford VS GM trans, nothing that pertains to "this" topic anyway. I highly recommend GM synchromesh ! It's what I run in my personal cars. I realize that Pennzoil makes Synchromesh and is 1/2 the price .... Seems to me there IS a difference though: the color, the smell, just seems like a slightly different fluid (for the better, but I cannot confirm differences in the 2). That said I run to local GM dealer .... Again, to each their own on that one. Nothing wrong with Pennzoil's stuff though, I'd recommend it any day over a uber slippery synthetic fluid. There's a fine line here fellas ..... You want some slick synthetics for the bearing life, but you NEED more friction to make the blocker rings do their job. The blocker rings is what gives the transmission it's "characteristics". That said, to me, those super high dollar synthetics is like this: great for bearings, horrible on blocker rings. Food for thought. My car is going on dyno tomorrow after a long hibernation .... Plan on doing a full fluid swap on it today including Pennzoil Sychromesh in the trans. [/QUOTE]
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best transmission fluid for '04 cobra?
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